Many student couldn’t _______, but the teacher _______ the problem by going into a detailed explanation

Câu hỏi :

Many student couldn’t _______, but the teacher _______ the problem by going into a detailed explanation

A catch up/ cleared away

B catch up with/ cleared off

C catch on/ cleared up

D catch at/ cleared out

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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