John fell asleep _______ he was listening to the CD.

A.a(chǎn)fter
B.while
C.before
D.if
B
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科目:初中英語 來源:期中題 題型:單選題

John fell asleep _______ he was listening to the CD.
[     ]
A.a(chǎn)fter
B.while
C.before
D.if

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