单项选择题

It is difficult to distinguish one twin () the other.

A. to
B. by
C. for
D. from

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单项选择题
That was so serious a matter that I had no choice but () the police.

A. called in
B. calling in
C. call in
D. to call in
单项选择题
It was last month () I took part in the party.

A. that
B. where
C. when
D. 不填
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