The dangerous virus ____ in the next few weeks in the laboratory can cause fatal diseases.
A．studyingB．studiedC．to studyD．to be studied
D
考查非謂語動(dòng)詞。to be done 表示將要被做，A項(xiàng)表示主動(dòng)進(jìn)行；B項(xiàng)表示完成被動(dòng)；C表示將要主動(dòng).
句意為實(shí)驗(yàn)室里接下來的幾個(gè)星期里要被研究的病毒會(huì)引起致命的疾病
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