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______ it have been the failure to pick up directions from the ground control that caused the air crash?

A．Must

B．Could

C．Would

D．Should

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Dr Smith, together with his wife and daughters, ________ visit Shanghai Expo this summer.

A．is going to

B．are going to

C．was going to

D．were going to

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A poet and artist ________ coming to speak to us about Chinese poems and painting tomorrow.

A．was

B．were

C．is

D．are

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It was after he got what he had wanted very much _______ he realized it was not important.

A．when

B．that

C．since

D．as

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This year this factory has produced ________ cars as it did last year.

A．as more than three times many	B．more than three times many as
C．more than three times as many	D．three times as more than many

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The famous writer our Chinese teacher often referred ________ at our school yesterday.

A．to arrive

B．arrived

C．to arriving

D．to arrived

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