Susan (think) _____________ about the idea for a while when he made the suggestion.

Câu hỏi :

Susan (think) _____________ about the idea for a while when he made the suggestion.

A thought          

B had been thought     

C had been thinking

D had thinking

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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