单项选择题

"100 yuan for this mirror! I ______ it would cost so much," said the woman in surprise.

A．know
B．hadn't known
C．don't know
D．didn't know
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单项选择题
______, the man jumped into the river to save the drowning child.
A．To take a deep breath
B．Breathing deep
C．Taking a deep breath
D．Taking a breath deeply
单项选择题
Small farms and the lack of modem technology have ______ agricultural production.
A．blundered
B．tangled
C．mingled
D．hampered
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