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【題目】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】

考查連詞辨析。句意:當冰川冰的迅速融化形成一條大河時,火山即將噴發(fā)。A. when當……時;B. if如果;C. but但是; D. till直到……為止。文中表示“當……時”,故選A。

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