Itseemsthatoilfromthispipefors

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It seems that 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
C．leaked	D．has been leaking

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that they may eventually reduce the amount of labor needed on construction sites by 90 percent．

A．Such construction robots are clever

B．So clever the construction robots are

C．Such clever construction robots are

D．So clever are the construction robots

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for the fact that she got hit by a car and broke her leg on her way to school, she might have passed the exam.

A．Hadn’t it been	B．Had it not been
C．Was it not	D．Were it not

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Hesitating what to do,.

A．so let’s not go outing	B．we had to stay home
C．the tour was cancelled	D．but we should still take the tour

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The retired man donated most of his savings to the school damaged by the earthquake in Yushu, _______ the students to return to their classrooms．

A．enabling	B．having enabled
C．to enable	D．to have enabled

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He spent at least as much time reading as you online yesterday.

A．had to chat	B．did chatting
C．do chatting	D．had chatted

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