__________the laser beam is very thin, it is intense enough to drill through the most delicate bones.

Câu hỏi :

__________the laser beam is very thin, it is intense enough to drill through the most delicate bones.

A When

B While 

C Since

D Although

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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