路堑的基本结构包括（）。
A.路堑基床底层
B.路堑基床表层
C.路堑排水系统
D.路堑边坡
E.路堑道床
参考答案：A, B, C, D
23．—It was careless of you___________your car unlocked all night.
—Oh, dear! .
A．to leave; So did I
B．leaving ; So did I
C．to have left; So I did
D．having left; So I did
根据汉语提示完成下列句子。
①He_________（说了一句粗鲁的话）about the woman who passed on us.
②He left_______________（说了几句话之后）．
③This region is_________（因……而出名）its scenery.
