The volcano was about to blow a large river run caused by rapidly melting glacier ice.A.whenB.ifC.bu

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编辑：chaxungu时间：2026-04-27 03:26:17分类：高中英语题库

【题目】The volcano was about to blow _____ a large river run caused by rapidly melting glacier ice.

A.whenB.ifC.butD.till

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【答案】A

【解析】

考查连词辨析。句意：当冰川冰的迅速融化形成一条大河时，火山即将喷发。A. when当……时；B. if如果；C. but但是； D. till直到……为止。文中表示“当……时”，故选A。