单项选择题

Why do you stand and watch the milk ______ over

A．boiled
B．from boiling
C．being boiled
D．boiling
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单项选择题
Tom ______ in class and that made his teacher angry.
A．kept on to make
B．is often writing
C．kept on talking
D．went to talking
单项选择题
My grandpa is very old and wears ______ false teeth.
A．a set of
B．a piece of
C．a sheet of
D．a pair of
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