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關閉窗口 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but she hasn’t decided yet (尚未決定) 可知，從開始失業時起一直在考慮再去上學，現在還在考慮。表示從過去某一時刻開始一直到現在，并且現在依然在發生的動作，用現在完成進行時，現在完成進行時由“have/has been doing”構成，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 為現在完成進行時，是許多中學生不太熟悉的一種時態，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引導的是時間狀語從句，根據“主將從現”原則，當主句為將來時態時，時間狀語從句不能直接用將來時態來表示將來意義，據此可排除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這一支點，故此選項也被排除。
4. Cathy is taking notes of the grammatical rules in class at
A. studies B. studied C. is studying D. has been studying
分析：D。根據句中的現在進行時可排除B，再根據句中的for a year可知此題選現在完成進行時最佳，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，所以導致了現在頭痛的結果，故空格處應填現在完成時或現在完成進行時，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“準備”指的肯定是從過去一直持續到現在的情況，故用現在完成進行時。
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