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【单选题】
拱桥的主要承重构件是A.
主拱圈
B.
拱上建筑
C.
桥台
D.
基础
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反馈参考答案：
举一反三
【单选题】—Sam, come downstairs, please. I need your help. —Sorry,mum. I __ on the phone.. [ ]
A.
am talking
B.
talked
C.
was talking
D.
have talked
【简答题】手机剧本3实验报告请于2016-12-24前提交
【单选题】----- Did you go to Sam's weekend party? ----- No, I ______________.
A.
am not invited
B.
wasn't invited
C.
haven't invited
D.
didn't invite
【单选题】I am at least ______ age ______ Robert if I am not older than he.
A.
the same.., as
B.
the same.., with
C.
as same.., as
D.
as same.., with
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