单项选择题

A survey suggests that nearly one in six children has difficulty（）to talk.

A．to learn
B．learning
C．learn
D．learnt

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单项选择题
There may be a need for retraining if you expect employees（）new technology.

A．using
B．use
C．to use
D．used
单项选择题
In addition to economic considerations, there are other reasons（）people work long hours.

A．what
B．why
C．when
D．where
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