单项选择题

I've heard him（）many times.

A. criticizing
B. criticized
C. criticizes
D. to criticize

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The mother didn't know（）to blame for the broken glass as it happened while she was out.

A. who
B. when
C. how
D. what
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Up（）into the air.

A. went the arrow
B. the arrow went
C. did the arrow go
D. does the arrow go
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