5000 câu trắc nghiệm Tiếng Anh 9 có đáp án - Phần 85
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Both viruses and genes_____ made from nucleoproteins. a. areb. is c. were d. has been

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Both viruses and genes_____ made from nucleoproteins.

are

is

were

has been

Giải thích

Chọn đáp án A