II. Chọn đáp án đúng có đáp án
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I don't know why this class is always so dirty because it ________ every morning A. was cleaned B. cleans C. cleaned D. is cleaned

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I don't know why this class is always so dirty because it ________ every morning

was cleaned

cleans

cleaned

is cleaned

Giải thích

Chọn đáp án D