Choose the best answer for the following sentence:

My car made strange noise, sputtered to a stop, and then wouldn't start again. Fortunately, the mechanic at my garage ____________ the cause of the problem.

A.

was discovering

B.

discovered

C.

was discovered

D.

has been discovered

Đáp án và lời giải

Đáp án:B

Lời giải:

discovered

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