— ______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 |
相关试题
I _____a girl,and Tony______a boy, we（我们）____friends.
| A．is; am,; are | B．am;is;are | C．am; are; are | D．am;are ;are |
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