It was his lack of confidence that surprised me. He surprised me by his lack

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Mark the letter A, B, C, or D on you answer sheet to indicate the sentences that is closest in meaning to each of the following questions
It was his lack of confidence that surprised me.

He surprised me by his lack of confidence.

What surprised me was his lack of confidence.

That his lack of confidence surprised me.

That he lacked of confidence surprised me.

Giải thích

Đáp án là B. What + S + V là mệnh đề danh ngữ, đóng vai trò như một danh từ , động từ theo sau luôn ở dạng số ít.