单项选择题


A．feed
B．are fed
C．eat
D．rely
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单项选择题
— Hi, be careful.— Sorry, ____________。
A．I don't notice
B．I'm not noticing
C．I wasn't noticing
D．I didn't notice
单项选择题
A．untilB．beforeC．whenD．as
A．until
B．before
C．when
D．as
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