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Put on your coat, or you'll catch a cold.
___________ you __________ put on your coat, you'll catch a cold.
Mary, put on your coat, ______ you'll catch a cold.
A. and B. or C .so D. but
Mary, put on your coat, ________ you'll catch a cold．
A．
and
B．
or
C．
so
D．
but