单项选择题

______ my sister's help we would not have finished the work.

A．If only
B．Except for
C．Now that
D．But for
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单项选择题
I bought a quart of milk and six ______ at the market.
A．corn's ears
B．ears of com
C．corn ears
D．ears of corns
单项选择题
He was so ______ on his book that he didn't find her come in.
A．intent
B．absorbed
C．engrossed
D．devoted
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