— ______sleep do you think is necessary for a Grade 9 student?— 8 hours at least.

题型：单选题题类：模拟题难易度：普通

— ______sleep do you think is necessary for a Grade 9 student?
— 8 hours at least.

A、How often B、How long C、How many D、How much

举一反三

- Every evening.

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—Four.

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—At 5:00 p. m. every day.

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