—What’s the matter? Why ______ —The signal is against us.

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问题 —What’s the matter? Why ______ —The signal is against us.

选项 A、the train stopping
B、does the train stop
C、is the train stopping
D、did the train stop

答案C

解析 用排除法。A、B、D都不对,D是过去时,而前面是现在时,所以后面的将来时态合适。
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