单项选择题

It is necessary that we ________ have a good command of English at college.

A．must
B．have to
C．should
D．ought to
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单项选择题
The most important ________ of his speech was that we should all work whole-heartedly for the people.
A．element
B．spot
C．sense
D．point
单项选择题
These plastic flowers look so ________ that many people think they are real.
A．beautiful
B．natural
C．artificial
D．similar
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