Chọn câu đúng nhất ứng với A (hoặc B, C, D) từ những từ gợi ý
it/ necessary/ us/ think/ about/ this matter.
A.It’s for us to think about this matter carefully necessary.
B.To think about this matter carefully it necessary for us.
C.For us to think about this matter it’s necessary.
D.It’s necessary for us to think about this matter carefully.

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