Normal climbing boots slip in icy conditions, so climbers ______________iron plates with spikes , known as crampons, to their boots.

Câu hỏi :

Normal climbing boots slip in icy conditions, so climbers ______________iron plates with spikes , known as crampons, to their boots.

A should be fixed                                                                    

B used to fix

C have been fixed

D have to fix

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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