题目内容
John waited at the bus stop for nearly an hour _____ the bus finally arrived.
[ ]
A. when
B. as
C. before
D. while
B. as
C. before
D. while
C
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John waited until he got back his breath and could speak .
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John waited until he got back his breath and could speak .
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A．normally |
B．commonly |
C．regularly |
D．formally |