单项选择题

It's cold outside. You'd better ______ your coat.

A．to put on
B．put on
C．take off
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单项选择题
He doesn't come today. He ______ be ill.
A．must
B．can
C．should
单项选择题
Which is Lucy's bag, the yellow one ______ the red one
A．and
B．but
C．or
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