—Would you like to come to dinner tonight? —I"d like to, __________I"m

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—Would you like to come to dinner tonight?
—I"d like to, __________I"m too busy.    [     ]
A. and
B. if
C. but
D. so

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举一反三

My sister doesn"t like bread. She won"t eat it ____________she is very hungry.          [     ]
A. if
B. when
C. as
D. unless

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Though it was late _____Mr Keller went on with his work.         [     ]
A. but
B. and
C. so
D. /

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--Why does he like koalas?
--        he thinks they are very cute.[     ]
A. Because
B. So
C. But
D. And

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I"ll wait here           he comes to see me.    [     ]
A. after
B. until
C. while
D. as soon as

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______ he comes, we won"t be able to go.[    ]
A. Without
B. Unless
C. Except
D. Even

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