单项选择题

John waited at the bus-stop for nearly half an hour ______ the bus finally arrived.

A．when
B．as
C．before
D．while
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单项选择题
-- ______ I didn't hear you clearly. It's too noisy here. --I was saying that the party was great.
A．Repeat.
B．Once again.
C．Sorry!
D．So what
单项选择题
I do every single bit of housework ______ my husband Bob just does the dishes now and then.
A．since
B．while
C．when
D．as
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