单项选择题

The relationship between employers and employees has been studied ______.

A. originally
B. extremely
C. violently
D. intensively
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单项选择题
The patient's health failed to such an extent that he was put into ______ care.
A. tense
B. rigid
C. intensive
D. tight
单项选择题
Watching me pulling the calf awkwardly to the barn, the Irish milkmaid fought hard to ______ her laughter.
A. hold back
B. hold on
C. hold out
D. hold up
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