单项选择题

In the idiom "in good feather", we change "good" into "high, full" without changing meaning. This change of constituent is known as______.

A. addition
B. replacement
C. position-shifting
D. variation
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单项选择题
According to the conversation when are all the big shops closed
A．On weekend.
B．On Sunday.
C．On workday.
D．On Saturday.
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