单项选择题

We will not attack（）we are attacked; if attacked, we will certainly counter-attack.

A. if
B. when
C. unless
D. even if

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单项选择题

--Whom do you want to see at the moment--The man（）Mr. zhang.

A. called himself
B. you call
C. calling himself
D. is called

单项选择题

He said he would drop（）at my house on his way home.

A. on
B. to
C. in
D. of

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