100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án

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I ________ (work) for Exxon for 10 years.

20/100

I ________ (work) for Exxon for 10 years.

have been working

had been working

was working

worked

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Chọn đáp án: B