题目内容

I had intended to call on you yesterday, but someone____________(come) to see me.

A. come
B. comes
C. is coming
D. came

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When Tom was a little boy, he already knew the sun________ (be) the center of the solar system.

A. are
B. be
C. is
D. has

I have worked here since I ________ (graduate) from college.

A. graduate
B. graduated
C. graduates
D. has graduated

By the time you get back, great changes_________________ (take place) in this area.

A. will have taken place
B. have taken place
C. will take place
D. had taken place

She told me her name only after I ________ (ask) her twice.

A. has asked
B. is asking
C. had asked
D. asked

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