单项选择题

It is _________ for us to try to decide whether television is a blessing or a curse.

A．elementary
B．initial
C．essential
D．primary
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单项选择题
His second film, Ideal Husband , __________ his fame as a film director.
A．secured
B．enforced
C．established
D．confirmed
单项选择题
__________ I came to China __________ I knew what kind of country she is.
A．It is not until; when
B．It is until; that
C．It was not until; when
D．It was not until; that
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