Weonitforseveralhoursbutwehave

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We _______ on it for several hours but we have not yet reached any conclusion.

A．work	B．areworking
C．havebeenworking	D．havebeenworked

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相关试题

---- There is a lot of smoke coming out of the teaching-building there.
---- Really? It _____ be a fire, most probably.

A．can

B．ought to

C．have to

D．must

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If you don’t wait _______ the red light, you will be punished by the policeman.

A．at

B．under

C．for

D．on

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________ doesn’t seem to have been much difficulty in solving the problem.

A．It

B．That

C．There

D．He

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It is fairly common in Africa for there______ a group of expert musicians surrounded by others who also join in the performances.

A．being	B．to be
C．be	D．is

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I_____ violin lessons every two weeks, but I think I ‘ll make it every week from next month.

A．am having	B．have had
C．have	D．have been having

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