单项选择题

George is one of those people who ______ trouble in working out this problem.

A. has
B. have
C. get
D. gets
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They tried to avoid ______ errors through carelessness.
A. make
B. to make
C. making
D. to have made
单项选择题
Is this the city______you visited last year
A. when
B. where
C. which
D. what
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