单项选择题

A．sources
B．origins
C．resources
D．materials
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单项选择题
A．sinceB．owing toC．on condition thatD．in case
A．since
B．owing to
C．on condition that
D．in case
单项选择题
A．with seemingly fruitless failuresB．with seemly fruitless failuresC．in seemingly fruitless failuresD．in seemly fruitless failure
A．with seemingly fruitless failures
B．with seemly fruitless failures
C．in seemingly fruitless failures
D．in seemly fruitless failure
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