单项选择题

We can hardly avoid making any mistakes in our work () hard we try.

A. whatever
B. how
C. no matter
D. however

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Mary, accompanied by her brothers, () warmly welcomed by the audience.

A. is
B. are
C. was
D. were
单项选择题
The children were surprised when the teacher had them()their books unexpectedly.

A. closed
B. to close
C. closing
D. close
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