It is worthwhile ______ those old bits of string because they could be of some use later

Câu hỏi :

It is worthwhile ______ those old bits of string because they could be of some use later.

A. to keep

B. kept

C. keeping

D. to have kept

* Đáp án

C

* Hướng dẫn giải

It is worthwhile + V-ing: Đáng giá làm gì

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