— ______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 |
— ______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 |
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