单项选择题

Reading such a thick book must ________ a lot of time.

A. spend
B. cost
C. take
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单项选择题
— ______ do you go to the cinema— Once a month.
A. How long

B. How often

C. How much
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My little sister is only five, ______ she can swim well.
A. but

B. so

C. because
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