Before becoming successful, Charles Kettering, former vice president of General Motors, was so poor

Câu hỏi :

Before becoming successful, Charles Kettering, former vice president of General Motors, was so poor that he has to use the hayloft of a barn as a laboratory

A. as

B. so poor

C. has to

D. successful

* Đáp án

C

* Hướng dẫn giải

Chọn C

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