题目
A.Every 60 s
B.Every 128 ms
C.Every 480 ms
D.Every 960 ms
E.Every 480 ms or 960 ms
第2题
__________? —About six yuan a kilo.
A. How old
B. How much
C. How often
D. How many
第4题
A.How soon
B.How long
C.How often
D.How many
第6题
How often()to the dentist?
A. you go to
B. do you go
C. do you
第7题
A.When will your train arrive?
B.How often do you take a train?
C.How long will the journey take ?
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