单项选择题

Robots are used （） a lot of work in place of man.

A. to do
B. to doing
C. doing
D. to be done

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How long does it （）to travel from Beijing to London

A. want
B. spend
C. make
D. take
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Neither Bill nor his parents（）at home.

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