单项选择题

When Pilot Office Peter Thwaites was away on business, his neighbou gave his wife ______ with the housework.

A．an aid
B．a help
C．a hand
D．a lift
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单项选择题
We tried to settle the problem with them as soon as possible, but they seemed to ______ sincerity.
A．lack of
B．be lack of
C．lack in
D．be lacking in
单项选择题
When our university laboratory bought this microscope we were given a one year's
A．reservation
B．security
C．proof
D．guarantee
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