---Why isn't he in the hospital with his injured mother?

---No one ______ him of the accident.

A．informed

B．informs

C．had informed

D．has informed

下列有关汇率的说法正确的是（）

A.外币汇率升高，外币币值贬值，本国货币币值升值

B.外币汇率跌落，外币币值升值，本国货币币值贬值

C.一国货币升值，有利于该国的商品出口，但不利于进口外国产品

D.一国货币升值，会带来该国出口产品的竞争力下降