Before the invention of the steamboat, there ____________ no way to cross the ocean.

Câu hỏi :

Before the invention of the steamboat, there ____________ no way to cross the ocean.

A has been

B could have been

C had been

D would be 

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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