—Some Chinese students find it difficult to understand native speakers when in London．

—Exactly,          they've learned a lot about grammar and known many words.

A．if only

B．now that

C．even if

D．as if

以下的招聘渠道不属于内部招聘的是（）

A、网络招聘

B、内部晋升

C、人员重聘

D、员工自荐