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You should make a careful plan ___ the experiment.

A．before to do

B．before doing

C．after to do

D．after doing

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相关试题

They improved the software to __________ for people to use computers.

A．make it easier	B．make easier
C．make it, s easier	D．A or B

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The English teacher laid particular __________ on the need of reading aloud.

A．stress	B．focus
C．intention	D．impression

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__________ money has been raised for the sick children in the mountainous villages.

A．A large amount of	B．Large amounts of
C．A large number of	D．A plenty of

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I will do it more carefully __________ it takes me hours.

A．even

B．till

C．even if

D．if

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I was on the highway when this car went past followed by a police car. They ______ at least 150 km an hour.

A．should have been doing	B．must have been doing
C．could have done	D．would have done

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