IshouldnothavelaughedifIyouwer

I should not have laughed if I ______ you were serious.

A．thought

B．would think

C．had thought

D．have thought

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A greenhouse is a building _______ of glass _______ for keeping plants warm when the outside temperature is low..

A．made, which is used	B．which is made, is used
C．made, being used	D．is made, used

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She is the only one of the persons ________ from the mistakes.

A．whom I know have learned	B．whom I know has learned
C．I know who has learned	D．I know who have learned

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About _______ gene-targeting drugs are already in testing pipeline. It won’t be long ______ they are put into effect.

A．two dozen; before	B．two dozens; that
C．two dozens of; before	D．dozens; that

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---_________________
---Thank you. I certainly will.

A．Happy New Year to you!	B．Don’t forget to post the letter!
C．May I help you?	D．Please remember me to your family.

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When you go by train, please see to it_______ you take an express, _______ that stops only at big stations.

A．that, one

B．/, the one

C．that, it

D．/, it

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