CHUYÊN ĐỀ 2 THÌ ĐỘNG TỪ (VERB TENSES)
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I'm tired. I……….the house since 9 this morning. A. am cleaning B. was cleaning C. had been cleaning D. have been cleaning

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I'm tired. I……….the house since 9 this morning.

am cleaning

was cleaning

had been cleaning

have been cleaning

Giải thích

Chọn D