题目内容

I' m afraid he （) find he key to this problem.

A. could never
B. never could
Couldn’ t never

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（) he knew it was just a joke,（)Peter looked fightened.

Although ，but
B. /， and
C. Although,/

In order to communicate with foreigners,we （) foreign language.

A. need to study
B. need studying
C. need study

She prefers （) together to working all by herself.

A. working
B. to work
C. to working

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A. wait
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C. waiting