Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 9)

While __________ to help Tom with his math, I got impatient because he wouldn‟t pay attention

5/64

Choose the best answer:

While __________ to help Tom with his math, I got impatient because he wouldn‟t pay attention to what I was saying.

I am trying

trying

I try

having tried

Giải thích

Đáp án là B

Rút gọn mệnh đề dạng chủ động: S+ V= Ving.