单项选择题

Contrast may make something appear more beautiful than it is when ______ alone.

A．seen
B．is seen
C．to be seen
D．having been seen
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单项选择题
The millions of calculations involved, had they been done by hand, ______ all practical value by the time they were finished.
A．had lost
B．would have lost
C．would lose
D．should have lost
单项选择题
As a public relations officex, he is said ______ some very influential people.
A．to know
B．to be knowing
C．to have been knowing
D．to have known
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