单项选择题

When______his homework，he heard someone singing．

A．he does
B．he doing
C．doing
D．did
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单项选择题
She found______rather difficult to cooperate with Jane．
A．it is
B．that
C．he is
D．it
单项选择题
Little______that the girl has fallen in love with him．
A．he knows
B．he doesn't know
C．does he know
D．doesn't he know
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