All the firemen in the city were ______ to fight against the big fire.

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问题 All the firemen in the city were ______ to fight against the big fire.

选项 A、called in
B、called off
C、called up
D、called on

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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