单项选择题

When ______ why he came in without permission, he stared at us, saying nothing.

A. asking
B. asked
C. being asked
D. to be asked
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单项选择题
The tower clock ______ eleven when Henry walked out of the police station.
A. hit
B. beat
C. struck
D. knocked
单项选择题
We were watching TV together ______ a stranger came in.
A. while
B. when
C. that
D. where
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