单项选择题

Linda was（） the experiment a month ago, but she changed her mind at the last minute.

A．to start
B．to have started
C．to be starting
D．to have been starting

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单项选择题
It is not uncommon for there（） problems of communication between the old and the young.

A．being
B．would be
C．be
D．to be
单项选择题
Ii is absolutely essential that William（）his study in spite of some learning difficulties.

A．will continue
B．continued
C．continue
D．continues
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