问题详情

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

参考答案
正确答案:C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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