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Hewasridingtoschool        itbegantorain.A.as       B.s...

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问题详情:

Hewasridingtoschool        itbegantorain.A.as       B.s...

He was riding to school         it began to rain.

A. as        B. so         C. while         D. when

【回答】

D

知识点:连词

题型:选择题