PRACTICE TEST 12- Đại từ nhân xưng, Đại từ sở hữu và Đại từ phản thân
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The reason why the millionaire committed suicide _______ so far. A. had not be known B. had not known C. has not known D. has not been known

48/100

The reason why the millionaire committed suicide _______ so far.

had not be known

had not known

has not known

has not been known

Giải thích

Chọn đáp án D