题目内容

Youyour tooth pulled out before it rot completely.

A. had better got
B. had to get better
C. had better to get
D. had better get

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As he had a heart attack, he was told that hecontinue the work.

A. needn't
B. may not
C. mustn't
D. can't

Ilike to make a suggestion.

A. could
B. would
C. must
D. might

I know things are hard with you, but I believe youget over the difficulties.

A. can
B. may
C. must
D. ought

心血管系统中进行物质交换的场所是（）

A. 心
B. 动脉
C. 静脉
D. 毛细血管