题目内容

The dangerous virus ____ in the next few weeks in the laboratory can cause fatal diseases.
A．studyingB．studiedC．to studyD．to be studied
D
考查非谓语动词。to be done 表示将要被做，A项表示主动进行；B项表示完成被动；C表示将要主动.
句意为实验室里接下来的几个星期里要被研究的病毒会引起致命的疾病
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