单项选择题

When I knocked at the door, my mother ______.

A．cooked
B．was cooking
C．cook
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单项选择题
— ______ is the weather like today—It's fine, but a bit cold.
A．What
B．How
C．Which
单项选择题
I'm old enough to wash ______ clothes by myself. You can just wash ______.
A．my, yours
B．your, my
C．mine, yours
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