题目内容

Don’t try doing it yourself. It requires ______ knowledge.

A. special
B. specialized
C. specialty
D. specialize

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The letter ______ to me yesterday was from my brother.

A. sent
B. which sent
C. sending
D. sends

Today, many factories make porcelain plates and other objects ______ throughout the world.

A. sells
B. selling
C. to sell
D. sell

He takes a cold shower every morning before ______ to work.

A. going
B. he has gone
C. gone
D. he went

Are you capable________ that tree?

A. of climb
B. for climbing
C. of climbing
D. for climb

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