ithavebeenthefailuretopickupdi

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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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The suggestion we should have a discussion on this problem is not the one ________he made.

A．that, /

B．/, which

C．which, that

D．which, /

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My suggestion is that Tom ______ there on time.

A．is

B．be

C．will be

D．has been

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--- Why didn’t you tell me the news of the meeting?
--- I knew nothing about it, or I _______ you.

A．would tell

B．had told

C．told

D．would have told

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Don’t forget _______ all the lights when you leave the classroom.

A．to turn off

B．turning off

C．turn on

D．turning on

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This book is very interesting, and it is worth ________ again.
A to read B．reads C．read D．reading

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