单项选择题

Are the terms "pure" and "applied" two totally different activities, having little or no interconnection, as ______ often implied

A．is
B．are
C．that
D．what
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单项选择题
A friend of mine returned to his house after a holiday only to find it ______ broken into.
A．be
B．was
C．had
D．had been
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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