By the end of last week, she______in the west of China for two months helping the homeless children.

A．will stay

B．has stayed

C．would stay

D．had stayed

多属周围型（）。

A.肺鳞状细胞癌

B.小细胞癌

C.肺腺癌

D.肺泡细胞癌

E.恶性间皮瘤