题目内容

________ water is to fish, so air is to man.

As if
B. if
C. As
D. Although

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Much hard ________ he tried, he failed to catch up with the first runner.

A. although
B. as
C. while
D. When

________ , I have to put it away and focus(集中)my attention on study this week.

A. However the story is amusing
B. No matter amusing the story is
C. However amusing the story is
D. No matter how the story is amusing

________ we are allowed ________ , we can’t drink any beer.

As long as; to do
B. If; to
C. Unless; to
D. On condition that; doing so

________ I admit that there are problems, I don’t agree that they cannot be solved.

A. While
B. If
C. As
D. Unless

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