—What caused the accident?

—It was my fault, sir. I _____ to the left.

A．ought not to have turned

B．needn’t have turned

C．shouldn’t turn

D．couldn’t turn

需要对孕妇进行产前诊断的是（）

A.严重遗传性疾病

B.孕妇患有传染病

C.对生育保健问题提供医学意见

D.为胎儿生长发育进行监护

E.医师发现或怀疑胎儿异常