单项选择题

Neither Bill nor his parents（）at home.

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

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单项选择题
If you meet people with a smile, you will certainly make a good （） on them.

A. impression
B. expression
C. impact
D. implication
单项选择题
Automatic machines can only do the jobs they （） to do.

A. have asked
B. ask
C. have been asked
D. will ask
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