单项选择题

Her boy is ill. She has to______ him at home.

A．look at
B．look after
C．look for
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单项选择题
He has spent______ time on his studies than his classmates.
A．a little
B．least
C．less
单项选择题
The thief was caught______ he was leaving the shop.
A．as
B．after
C．before
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