单项选择题

Tom's mother kept telling him that he should work harder, but ______ didn't work.

A．he
B．it
C．which
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单项选择题
My mother asked me ______ her with the cooking.
A．helps
B．to help
C．helping
单项选择题
They lost their way in the forest, and ______ made matters worse was the night began to fall.
A．that
B．what
C．it
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