单项选择题

Attempts to persuade her to stay after she felt insulted were ______.

A．of no avail
B．out of focus
C．at a loss
D．in no way
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单项选择题
Scientists are ______ certain that there is a cancer-inhibiting agent in the blood of the shark.
A．dubiously
B．virtually
C．queerly
D．randomly
单项选择题
Of the 1, 200 million people who call themselves Chinese, ______ a very small number speak what is referred to as standard Chinese.
A．none but
B．but for
C．all but
D．but then
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