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问题

__________ do I have to change the robot’s batteries? —Every two months.

A:How long
B:How soon
C:How often
D:How many
正确答案是:
标签: do , how
同类题型

Rick often plays volleyball______ his friends.[ ]

I really don’t know where he comes from. [ ]

―It’s a pity that many people lost their lives in the wreck accident in South Korea.― I think so. It’s not wise _______ the captain to _____ first.

______ number of the students in Class 1 ______ forty-four.

Some researchers believe that there is no doubt ______a cure for AIDS will be found.

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