单项选择题

I don't know ______ it was that answered the phone this morning.

A．who
B．why
C．how
D．that
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单项选择题
I'd just do as soon as you ______ the research yourself.
A．do
B．will do
C．would do
D．did
单项选择题
During the famine of 1943, millions of Chinese peasants ______ to the cities because they could not survive in the rural areas.
A．migrated
B．emigrated
C．immigrated
D．mobilized
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