They tired _______now because they ________ in the garden since 8 oclock

Câu hỏi :

They _______ tired now because they ________ in the garden since 8 o'clock

A. are / worked

B. were / were working

C. are / have been working

D. were / worked

* Đáp án

C

* Hướng dẫn giải

Trong thì HTHT TD, since + mốc thời gian

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