单项选择题

—Was his father very strict with him when he was at school
—Yes. He had never praised him （）he became one of the top students in his grade.

A. after
B. unless
C. until
D. when

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单项选择题

You'd better （）loudly when they are sleeping.

A. speak
B. to speak
C. not to speak
D. not speak

单项选择题

—Why was the price of bread so high that year —（） the war broke out.

A. As
B. Since
C. For
D. Because

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