Question

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

A.whenB.ifC.butD.till

Answer 1

【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。