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Trong không gian với hệ tọa độ Oxyz tính khoảng cách d từ điểm M(1;3;2) đến đường thẳng 

∆ : x   = 1 + t y   =   1 + t z   =   - t

A.  d = 2

B. d = 2

C.  d   =   2 2

D. d = 3

The authorities ______ actions to stop illegal purchase of wild animals and their associated products effectively. However, they didn’t do so

A. needed have taken

B. should have taken

C. had to take

D. must have taken