问题

______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 ;

正确答案是：

同类题型

________ that I won’t tell anyone your secret. You should trust me.

we must ___ to the public the simple fact that drug are dangerous.

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Mark was afraid of being scolded，so he________say what he thought to his parents.