单项选择题

Have you ever asked him the reason ______ may explain his absence from the class

A. why
B. when
C. that
D. what
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单项选择题
Free medical treatment in this country covers sickness of mind as well as ______ sickness.
A. normal
B. regular
C. average
D. ordinary
单项选择题
It suddenly ______ to me that somebody might be able to lend us the money.
A. came
B. turned
C. referred
D. occurred
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