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When I try to understand __________that prevents so many Americans from being as happy as one might expect, it seems that there are two causes.

A．why it does

B．what it does

C．what it is

D．why it is

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Last night Li Ping watched the football match at my home, so he________ in his office.

A．needn’t have worked	B．mustn’t haven’t worked
C．shouldn’t have worked	D．couldn’t have worked

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The film ______ on the book by Jack London is well worth________.

A．basing; seeing

B．based; being seen

C．to be based; to see

D．based; seeing

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The number of people invited_______ fifty, but a number of them_______ absent for different reasons.

A．were, was

B．was, were

C．was, was

D．were, were

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It’s the third time he _________with her in a week.

A．had quarreled

B．quarreled

C．has quarreled

D．quarreling

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―I’ll be away on a business trip. Would you mind looking after my cat?
―Not at all. ___________.

A．I have no time

B．I’d rather not

C．I’d like it

D．I’d be happy to

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