单项选择题

Remember ______ the letter in the post office, will you

A．post
B．to post
C．posting
D．to have posted
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单项选择题
Since you need to catch an early train tomorrow morning, we ______ now.
A．might as well leave
B．had better to leave
C．ought to have leave
D．should have to leave
单项选择题
In architecture (建筑学), a vault (拱顶) is a proof or ceiling in the ______ of an arch.
A．form
B．figure
C．shape
D．appearance
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