属于烷化剂类药物的是（） A.氮芥 B.甲氨蝶呤 C.平阳霉素 D.长春新碱 E.阿

Dina, ____ for months to find a job as a waitress, finally took a position at a local advertising agency.   [ ]

A. struggling                  

B. struggled  

C. having struggled            

D. to struggle

泵站按其作用可分为：污水泵站和雨水泵站。

棉花：棉田

A．灯光：灯火

B．海滩：海豚

C．庙会：庙宇

D．茶树：茶园

House prices keep rising these days. A flat in our city costs ____ now as in 1990.

A．as three times much

B．as much three times

C．much as three times

D．three times as much