Conservation organizations help for preserving the ecology of area by keeping track of endangered species.

Câu hỏi :

Conservation organizations help for preserving the ecology of area by keeping track of endangered species.

A. Conservation

B. for preserving

C. keeping

D. endangered

* Đáp án

B

* Hướng dẫn giải

Đáp án B

for preserving ---> to preserve/ preserve

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