单项选择题

Mike was walking along the street ______ he ran into an old friend.

A) when
B) who
C) which
D) whom
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单项选择题
Although he lives alone in the countryside. he doesn't feel ______ .
A) alone
B) on his own
C) himself
D) lonely
单项选择题
The star has been playing basketball ______ he was a boy.
A) during
B) when
C) since
D) as
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