MODULE 1 - Đại từ nhân xưng, Đại từ sở hữu và Đại từ phản thân
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There were marks on the snow but _______ unrecognizable. A. it was B. they were C. it is D. they are

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There were marks on the snow but _______ unrecognizable.

it was

they were

it is

they are

Giải thích

Chọn đáp án B