I think ________ outside in the open air is much more enjoyable than __________ exercise in some stuffy gym.

Câu hỏi :

I think ________ outside in the open air is much more enjoyable than __________ exercise in some stuffy gym.

A to walk – done                                                 

B walking – doing

C walk – to be doing                                           

D having walked – do

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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