单项选择题

Under no circumstances ______ be left alone with any dog, since there is inevitably a risk of conflict.

A. a young child should
B. should a young child
C. will a young child
D. a young child wiI1

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单项选择题

Many thanks were extended to those who had their thoughts on the ______ of new material to customers.

A. release
B. retrieval
C. receipt
D. reverse

单项选择题

There are 20 centrally heated bedrooms, ______ has been individually designed.

A. each of which
B. each of them
C. each of those
D. they each

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