Unfortunately, no one knows ________ prevented the rumor from spreading.

A. what was it that B. what it was that

C. how was it that D. how it was that

 

B

【解析】

試題分析：考查強(qiáng)調(diào)句和賓語(yǔ)從句。句意：不幸的是，沒(méi)有人知道是什么阻止了謠言的傳播。knows后跟賓語(yǔ)從句，從句缺少主語(yǔ)，故用what，排除C、D；賓語(yǔ)從句用陳述語(yǔ)序，A項(xiàng)是疑問(wèn)語(yǔ)序，排除A，故選B。

考點(diǎn)：考查強(qiáng)調(diào)句和賓語(yǔ)從句

 

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