单项选择题

Although customers keep complaining about their poor service, they've made no ______ to make any improvement.

A．action '
B．trial
C．attempt
D．progress
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单项选择题
I don't doubt ______ he will come on time.
A．whether
B．which
C．what
D．that
单项选择题
______ the advances of scientific forecasting, in spite of the thousands of daily bulletins and advisories that get flashed about, the weather is still ultimately capricious and unpredictable.
A．For all
B．But for
C．As for
D．As to
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