It's difficult _____ this work.[ ]
A. do
B. does
C. did
D. to do
答案：D
She was married _____ a rich man.[ ]
A. with
B. to
C. about
脑出血最常见的动脉是（）
A.小脑齿状核动脉
B.基底动脉旁正中动脉
C.大脑中动脉豆纹动脉
D.脉络膜前动脉
E.前交通动脉
