Tom isn’t on the phone, _________ makes it difficult to contact him.

Câu hỏi :

Tom isn’t on the phone, _________ makes it difficult to contact him.

A. that

B. what

C. which

D. who

* Đáp án

C

* Hướng dẫn giải

Đại từ quan hệ thay thế cho cả vế trước Tom isn’t on the phone.

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