The scientist became convinced that life exists on Mars while___the stone.
A.studying B.studyed
人气:283 ℃ 时间:2019-08-19 10:05:55
解答
A为什么呢?是省略句,把它还原你就明白了The scientist became convinced that life exists on Mars while( he was ) studying the stone.另外,while 后一般用进行时态
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