(Viên chức Mầm non) 5000+ câu trắc nghiệm Ngoại ngữ có đáp án - Test 2

She has been ________ work with a bad back since July.

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II.   LANGUAGE FOCUS

a. Choose the word or phrase - a, b, c or d - that best completes the sentence.

She has been ________ work with a bad back since July.

on

out

at

off

Giải thích

Đáp án đúng là d.