This class, ___________ is a prerequisite for microbiology, is so difficult that I would rather

Câu hỏi :

This class, ___________ is a prerequisite for microbiology, is so difficult that I would rather drop it.

* Đáp án

D

* Hướng dẫn giải

Đáp án D. which

Mệnh đề quan hệ: which thay thế cho ‘this class’

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