20 câu Trắc nghiệm Tiếng Anh 12 Cánh diều Chuyên đề 11: Thì của động từ (Verb tenses)
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Mary_________on the essay for two hours now and she hopes to finish in one more hour. A. is working B. has worked C. will have worked D. has been working

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Mary_________on the essay for two hours now and she hopes to finish in one more hour. 

is working

has worked

will have worked

has been working

Giải thích

Chọn đáp án D