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Thedangerousvirus

練習題1.8W

問題詳情:

Thedangerousvirus

The dangerous virus ______ in the next few weeks in the laboratory can cause fatal diseases.

A.studying            B.studied                    C.to study                  D.to be studied

【回答】

D

知識點:非謂語動詞

題型:選擇題