单项选择题

Many teenagers feel no difficulty （） computer.

A．to learn
B．learn
C．in learning
D．learned
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Some areas, （） their severe weather conditions, are sparsely populated.
A．due to
B．but for
C．in spite of
D．with regard to
单项选择题
He might have been killed （） the arrival of the police.
A．except for
B．with
C．for
D．but for
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