2. Now that she is out of a job, Lucy ______ going back to school, but she hasn’t decided yet.

A. had considered      B. has been considering C. considered         D. is going to consider

分析：B。根據(jù)but she hasn’t decided yet (尚未決定) 可知，從開始失業(yè)時起一直在考慮再去上學(xué)，現(xiàn)在還在考慮。表示從過去某一時刻開始一直到現(xiàn)在，并且現(xiàn)在依然在發(fā)生的動作，用現(xiàn)在完成進(jìn)行時，現(xiàn)在完成進(jìn)行時由“have/has been doing”構(gòu)成，所以選B。

3. I won’t tell the student the answer to the math problem until he ______ on it for more than an hour.

A. has been working  B. will have worked   C. will have been working     D. had worked

分的：A。has been working 為現(xiàn)在完成進(jìn)行時，是許多中學(xué)生不太熟悉的一種時態(tài)，因此要想通過分析句子直接從正面選出答案可能有一定困難。但是，如果我們用排除法來分析，則問題變得很簡單：首先，由于until引導(dǎo)的是時間狀語從句，根據(jù)“主將從現(xiàn)”原則，當(dāng)主句為將來時態(tài)時，時間狀語從句不能直接用將來時態(tài)來表示將來意義，據(jù)此可排除B和C; 而選項D為過去完成時，也不能選，因為“過去完成時”必須以“過去”為支點，表示“過去的過去”，但此句并沒有過去時態(tài)這一支點，故此選項也被排除。

4. Cathy is taking notes of the grammatical rules in class at Sunshine School, where she ______ English for a year.

A. studies                 B. studied                 C. is studying            D. has been studying

分析：D。根據(jù)句中的現(xiàn)在進(jìn)行時可排除B，再根據(jù)句中的for a year可知此題選現(xiàn)在完成進(jìn)行時最佳，即選D。

5. —I have got a headache.

—No wonder. You ______ in front of that computer too long.

A. work                    B. are working          C. have been working    D. worked

分析：C。由于在電腦前工作太久，所以導(dǎo)致了現(xiàn)在頭痛的結(jié)果，故空格處應(yīng)填現(xiàn)在完成時或現(xiàn)在完成進(jìn)行時，即答案選C。

6. —I’m sure Andrew will win the first prize in the final.

—I think so. He ______ for it for months.

A. is preparing           B. was preparing       C. had been preparing    D. has been preparing

分析：D。根據(jù)句中的…will win the first prize in the final可知，決賽還沒有舉行，所以下文談到的“準(zhǔn)備”指的肯定是從過去一直持續(xù)到現(xiàn)在的情況，故用現(xiàn)在完成進(jìn)行時。

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