Bộ 20 đề ôn thi vào Chuyên Anh năm 2023 cực hay có lời giải (Đề 39)

While_________ to help him with his essay, I got impatient because he wouldn’t pay attention to what I was saying. A. I am trying B. having tried C. I try D. trying

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While_________ to help him with his essay, I got impatient because he wouldn’t pay attention to what I was saying.

I am trying

having tried

I try

trying

Giải thích

Chọn D