单项选择题

They tried to avoid ______ errors through carelessness.

A. make
B. to make
C. making
D. to have made
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Is this the city______you visited last year
A. when
B. where
C. which
D. what
单项选择题
The Browns felt ______ about leaving their son alone at home.
A. keen
B. uneasy
C. dazed
D. miserable
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