单项选择题

The children should learn to do some washing by ______.

A．they
B．them
C．themselves
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单项选择题
They ______ a football match at four o'clock yesterday afternoon.
A．had
B．were having
C．had had
单项选择题
He is quite a good singer, ______ his father used to be.
A．like
B．so
C．as
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