单项选择题

It is essential that all the details in this case ______ first.

A．is investigated
B．was investigated
C．be investigated
D．shall be investigated
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单项选择题
This young man's attraction to MP3s cannot be explained only ______ familiarity with technology.
A．with terms of
B．by terms of
C．on terms of
D．in terms of
单项选择题
William Penn planned Philadelphia as the holy city , carefully ______ so that each house would have the appearance of a country cottage.
A．laid on
B．laid by
C．laid out
D．laid down
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