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7. Excuse me, Marcia, a reporter from Vanity Fair ______ all day. Could you speak to her now?

A. phones                 B. has phoned           C. has been phoning   D. phoned

分析：C。根據(jù)句中的時(shí)間狀語all day和謂語動(dòng)詞phone的特點(diǎn)（為非延續(xù)性動(dòng)詞）可知，句子應(yīng)用進(jìn)行時(shí)態(tài)（表示動(dòng)作不斷重復(fù)），而選項(xiàng)中只有C為現(xiàn)在完成進(jìn)行時(shí)。句意為：瑪西婭，打攪你一下，有名來自《名利場(chǎng)》的記者一整天都在打電話來，你現(xiàn)在能和他說說嗎？又如：She is very tired. She’s been typing letters all day. 她很累了。她整天都在打信件。

8. Over the past decades, sea ice ______ in the Arctic as a result of global warming.

A. had decreased       B. decreased             C. has been decreasing  D. is decreasing

分析：C。介詞短語“over the past [last]+時(shí)間段”的意思是“在過去的……時(shí)間中”，它指的是從過去某時(shí)持續(xù)到現(xiàn)在的一段時(shí)間，所以通常與現(xiàn)在完成時(shí)或現(xiàn)在完成進(jìn)行時(shí)連用，故答案選C。句意為：過去幾十年來，由于全球變暖，北極的海冰正慢慢消融。又如：Technology in this field has matured considerably over the last decade. 這一領(lǐng)域的技術(shù)經(jīng)過過去10年的發(fā)展已經(jīng)相當(dāng)完善。

9. —Why, Jack, you look so tired!

—Well, I ______ the house and I must finish the work tomorrow.

A. was painting         B. will be painting      C. have painted          D. have been painting

分析：D。現(xiàn)在完成進(jìn)行時(shí)表示從過去一直持續(xù)到現(xiàn)在的動(dòng)作。在此題中，由于“一直在刷油漆”，所以才導(dǎo)致“看上去非常疲憊”，故選D最符合句意。

10. Mother wanted to be a good provider, a role she ______ since her marriage to Father.

A. shoulders              B. shouldered            C. is shouldering        D. has been shouldering

分析：D。根據(jù)空格后的since可知，此處談?wù)摰氖菑倪^去一直持續(xù)到現(xiàn)在的情況，故用現(xiàn)在完成進(jìn)行時(shí)最合適。

11. Joseph ______ to evening classes since last month, but he still can’t say “What’s your name?” in Russian.

A. has been going      B. went                    C. goes                     D. has gone

分析：A。根據(jù)句中的since可知，空格處應(yīng)填完成時(shí)態(tài)，故可排除B和C；根據(jù)句意，空格處填現(xiàn)在完成進(jìn)行時(shí)比填現(xiàn)在完成時(shí)更合適，因?yàn)樗�更�?qiáng)調(diào)“一直在做某事”。又如：He has been working since noon. 他從中午就開始工作了。He was taken ill and no wonder, considering he has been overworking for years. 他生病了，也難怪，多少年他一直過度辛勞。

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