wasittheydiscoveredtheentrance

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--__________ was it_________ they discovered the entrance to the underground place?
--Totally by chance.

A．How; that

B．What ; that

C．When; when

D．Where; that

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Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.

A．since

B．before

C．after

D．when

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The girl__________ on the ground __________to me that she had___________ the book on the shelf.

A．lying; lay; laid	B．lay; lied; laid
C．lie; lied; lay	D．lying; lied; laid

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--No. I __________ her, but she was away on business.

A．would like to invite	B．would have liked to invite
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A．made

B．being made

C．having made

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--Do you know when the Chinese custom_________ from?
--It's hard to say. But its characteristics__________ the Tang Period.

A．began; prove	B．started; show
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