Question

----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

Answer 1

A

考查連詞。before 在什么之前，才，就，since自從，when 當什么時候，句意：你多久把書寄給我？再過兩天你就會收到我的書。所以選A。