单项选择题

Only ______ according to the directions can the medicine be quite effective.

A．taking
B．taken
C．being taken
D．having been taken
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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
单项选择题
--Is there a fog in the evening --There ______ be. I'll make a phone call to find it out.
A．must
B．would
C．win
D．might
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