单项选择题

Tom was absent today because he had to ______ his ill little brother.

A．look at
B．look after
C．look for
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单项选择题
You can't ______ playing basketball just because your parents don't support you
A．give back
B．give up
C．give in
单项选择题
It's a fine day, why ______ go out for a picnic
A．don't
B．doesn't
C．not
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