3We were about to climb up to the top of the mountain ________ it began to r

3We were about to climb up to the top of the mountain ________ it began to r
We were about to climb up to the top of the mountain_______ it began to rain heavily.
A. as B.while C.when D.since
英语人气:671 ℃时间:2019-08-20 14:48:31
优质解答
C be about to...when...
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