Mr Wang______an article on how to improve spoken English last month, but I don’t know whether he has finished it.

A．has written 　

B．wrote 　

C．had written 　

D．was writing

多媒体教学资源的应用方法有（）观察法、聆听法、示范法、习作法。

A.了解法

B.评价法

C.导视法

D.诊断法