题目内容

Mary dropped in Mr Smith, but he wasn' t at home, so she went to drop in Mr Smith's office.

A. on, on
B. at, at
C. on. at
D. at. on

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The teacher is not only strict his pupils but also strict his own work.

A. with, with
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A. from,of
B. of,from
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A. into
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A. between
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D. about