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21. ________ the man grew older, he lost interest in everything except gardening.
A. With B. Since C. While D. As
22. ________ you understand this rule, you’ll have no further difficulty.
A. Once B. Unless C. As D. Until
23. I had no sooner got back to the kitchen ________ the door-bell rang loud enough to wake the dead.
A. when B. than C. as D. while
24. I criticized him, you know, not ________ I hate him but ________ I love him.
A. because; because B. because; for C. for; because D. for; for
25. ________ he studies hard, he will never pass the examination.
A. If B. Unless C. Even if D. Even though
26. She worked hard ________ everything would be ready by the time he came back.
A. since B. so that C. as if D. unless
27. He waited ________ the volcano became quiet and he was able to return two days later.
A. when B. before C. as D. until
28. — May I go and play football with Dick this afternoon, Dad?
— No, you can’t go out ________ your work is being done.
A. before B. until C. as D. after
29. A warning news report from Qatar announces that a group of Islam will continue to kill Americans wherever they are ________ they leave the Arab world forever.
A. even though B. in case C. whenever D. until
30. I was so familiar with her that I recognized her voice ________ I picked up the phone.
A. the moment B. after C. before D. while
【答案解析】
1. D. 考查“祈使句/名詞+and+陳述句”句型。句意為：“再努力點，你就會成功的”。
2. B. so(因此)是并列連詞，引出一個表示結果的分句，前面應是一個表示原因的分句，而無需再用連詞，排除A；C和D又不是句子，也錯了。
3. D. 因為rather than是對稱連詞，意為“而不” (from www.hz123456.com)。
4. A. 因為but是并列連詞，后面是個句子，前面也一定是個句子，而不是一個分詞短語或不定式短語，更不能再用連詞though，所以排除B、C和D。
5. C. 考查“祈使句+and+陳述句”句型，意為“如果…就…”。雖然or也可用于此句型，但or是“否則、要不然”之意，如：Work hard, or you’ll fail. (努力學習，否則就會不及格。)
6. D. 因為not only…but (also)…是固定搭配(from www.hz123456.com)。
7. D. 因為句中的并列連詞for表示原因，是對前面分句所述內容的解釋或補充說明。
8. A. 因為句中的并列連詞while表示“對比或相反”。
9. B. 因為句中的并列連詞when = just at that time, 意為“這時(突然)”。
10. D. 因為只有or才能表示選擇，意為“(是…) 還是”。
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