Last month, the Japanese government expressed their thanks for the air they_______ from China.

A．receive

B．are receiving

C．have received

D．had received

案件检查特点（）。

A、性质的特殊性；

B、主体的双重性；

C、对象的交叉性；

D、依据的多元性；

E、手段的无限性。