最常见的女性不孕因素是（）。
A.宫体因素
B.精神因素
C. * * 因素
D.输卵管因素
E.宫颈因素
参考答案：D
The news about the terrible flood there greatly discouraged __________ there for sightseeing.
A．us from going
B．us to go
C．our going
D．our to go
She went to the supermarket and ______ what she needed, she returned home, light-hearted.
A．bought
B．having bought
C．buying
D．to have bought
