{01}The earth became so violent that it was not clear_________ the shape would last or not. A.if B.how C.whether D.why 解析:考查:whether常与or not 连用,句意:地球表的如此的猛烈以至于地球的形状是否会持续还是不持续还不清楚。故选C。 本题选C。 {02}It was several years later________ an American ship paid the first official visit to the island. A.since B.when C.that D.as 解析: 本题选C。
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