Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

Câu hỏi

The teacher explained the complex concept carefully. His students couldn’t understand it.

A. Not until the teacher had explained the complex concept carefully could his students understand it.

B. Scarcely had the teacher explained the complex concept carefully when his students couldn’t understand it.

C. However carefully the teacher explained the complex concept; his students couldn’t understand it.

D. No sooner had the teacher explained the complex concept carefully than his students could understand it.

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