再如：
It's reported that by the end of the month the output of cement in the factory ____ about 10%.
A.will have risen
B.has risen
C.will be rising
D.has been rising
答案：A
6.与现在完成时不同，现在完成进行时则表示某个动作从过去持续到现在，并且仍在进行，如8)和10)。
8)I on the door for ten minutes now without an answer.(1998.6)
A.was knocking
B.am knocking
C.knocking
D.have been knocking
答案：D
10)Since he left the university, he _____ in an accounting company.
A.has been working
B.had worked
C.had been working
D.was working
答案：A
再如：
We have been working on this project for over a month now.
「考试策略」
1)根据时间状语选择时态，特别是完成时的时间状语一般表示"到……为止"，以"by"短语居多。如果句中的时间状语是由by引出的短语或从句，谓语动词一般用完成时态，如：
By the time we got there, the fire had already been put out.
We'll have completed the task by the time you come back.
2)如果没有时间状语，那就根据试题中出现的动作发生的顺序做出判断。如：
He found the book that he had lost.
A B
3)注意特殊句型中的时态，如：
①hardly/scarcely …when… 和no sooner… than…
Hardly had I put down the receiver when the telephone rang again.
我刚放下话筒，电话又响了。
No sooner had they got to know the news than they went to the bar to enjoy a drink.
他们一得到消息，他们就去酒吧喝酒了。
②祈使句表示一种条件，第二个分句中一般要用will表示在这种条件下可能发生的事情。如：
Turn on the television or open a magazine and you _____ advertisements showing happy families.
A.are often seeing
B.often see
C.will often see
D.have often seen
答案：C
但是，本题中often的使用可能会造成一定的迷惑。这就要求考生对各种时态的表达方式，以及其作用了解清楚。will可以表示习惯.
责任编辑：mman
