All the firemen in the city were ______ to fight against the big fire.
A、
called in
B、
called off
C、
called up
D、
called on
【正确答案】
C
【答案解析】
解析：called in意为“回收”；called off意为“取消”；called up意为“召集，打电话，使人想起”；called on意为“访问(某人)”。
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