Many farmers have taken advantage of rain when it is going to come, by
单选题Many farmers have taken advantage of rain when it is going to come, by making hay and stockpiling other fodder.
A.while it is coming
B.when it does come
C.when it has come
D.while it will come
参考答案：B
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答案解析：助动词用法。when引导的从句的意思是“当确实下雨时”，用does表示强调。
