I’vebeenstudyingthescienceofouter

发布时间:2020-07-26 03:09:39

I’ve been studying the science of outer space in the last ten years and now I still ________.A.doingB.amC.beD.have

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B解析考查时态,我在过去的十年里一直研究外太空科学,现在仍然在研究,后半句是现在进行时的省略句:I am still studying it now.
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