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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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
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Human skin is very thin on the eyelid and quite thick on the（）of the foot.

A. sole
B. soul
C. base
D. basis
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