例:This is the second time that the products of our company have been shown in the International Exhibition.(这是我公司产品第二次参加国际展览会。)
D) 句型"It is/ has been……since"所使用的两种时态都正确。
例:It is/ has been 10 years since I last saw him.(从我上次见到他以来已经10年了。)
E) 在"no sooner than"、"hardly/ scarcely ……when"、"before"、"prior to"等句型中,主句要求完成时。
例:I haven't met that professor prior to today.(以前我从未见过那位教授。)
4. 现在完成进行时(have been doing)
用法:表示某一动作开始于过去某一时间,延续或重复地出现至今,或将继续延续至将来。
例:We have been working on this project for over a month now.(到目前为止,我们一直在处理那个项目,已经花了一个多月时间了。)
注意事项:与现在完成时相比,现在完成进行时更强调:在从过去到现在的时间里,动作或状态一直持续或一直反复出现。
例:1997年6月四级第45 题
It seems oil ___________ from this pipe for some time. We'll have to take the machine apart to put it right.
A) had leaked B) is leaking
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