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

A.whenB.ifC.butD.till

【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。

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