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A number of tests have been conducted to _________ that these drugs have no side effects.

A．find out

B．look for

C．make sure

D．work out

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相关试题

He must have been annoyed by something yesterday, _____?

A．wasn’t he

B．hasn’t he

C．needn’t he

D．mustn’t he

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Children _____ to difficult situations are better at handling those _____ tasks.

A．exposing; challenging;	B．exposed; challenged
C．exposed; challenging	D．exposing; challenged

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---Are you happy with this lab?
---Not a little. We can’t have _______.

A．a worse one

B．a nicer one

C．such a worse one

D．such a nicer one

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What kind of things do people often buy during _____ Christmas and _____ Spring Festival?

A．/ ; the

B．the; /

C．the; the

D．/; /

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_______ snacks and drinks，but they also brought cards for entertainment when they had
　 a picnic in the forest.

A．Not only they brought	B．Not only did they bring
C．Not only brought they	D．Not only they did bring

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