Recently, the island of Hawaii (A) had been (B) the subject of intensive research (C) on the occurrence (D) of earthquakes

Câu hỏi :

Recently, the island of Hawaii (A) had been (B) the subject of intensive research (C) on the occurrence (D) of earthquakes

A the island of Hawaii

B had been

C intensive research

D occurrence

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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