I know you’re planning to travel this summer, but do you know __?<br />A.how much cost it will be <br>B.how much has it cost<br>C.how much it will cost<br>D.how much will it cost

I know you’re planning to travel this summer, but do you know __?
A.how much cost it will be
B.how much has it cost
C.how much it will cost
D.how much will it cost

出自：国家开放大学英语语法

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