题目内容

Most animals have little connection with animals of a different kind, ________ they hunt them for food.

A. if
B. while
C. unless
D. As

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Hard working though he was, ________ there was never enough money to pay he bills.

A. /
B. and
C. but
D. Therefore

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

As if
B. if
C. As
D. Although

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

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