----How soon will you send the book to me?--It will be two days you receive my book.A.

问题补充：

----How soon will you send the book to me?

----It will be two days you receive my book.

A. before

B. that

C. since

D. when

答案：

(答案→)A. before

B. that

C. since

D. when

解析：考查连词。before 在什么之前，才，就，since自从，when 当什么时候，句意：你多久把书寄给我？再过两天你就会收到我的书。所以选A。