－Whenwillwemeetagain?－Itwon'tbelong．Iwillbeback

问题详情：

－When will we meet again?

－It won't be long．I will be back ________ three days．

A．in                           B．after                       C．for                  D．since

【回答】

A

知识点：介词和介词短语

题型：选择题