题目内容

The two good friends () until Miss Wu came into the classroom.

A. chated
B. chat
C. are chatting
D. chatted

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It () away a moment ago.

A. is flying
B. flyed
C. flew
D. flies

When () your mother () you that blue dress, Mary?

A. does, buy
B. has, bought
C. had, bought
D. did, buy

----Hi,Jim! Nice to meet you!----Hi, it is one year since I last () you.

A. saw
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Smoking can increase the of developing heart disease.吸烟会增加得心脏病的危险。