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    1.若直线a与b是异面直线，直线b与c是异面直线，则直线a与c的位置关系是　　　　　 (　 D　 )　

    ?　　 A.相交?　　　　 B.相交或异面　?C.平行或异面?　　　 D.平行、相交或异面　

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    30. -What about going out this evening?

    　 　-Oh, I don't know. I've got a bit of a headache. And, 　　　　　John’s coming to see me, so I ought to stay in.

    　　 A. though　　　　　 B. therefore　　　　 C. however　　　 　D. anyway

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    29. With some urgent business ______, Mr Smith has decided to put off his journey to Paris.

    　 A. attending to　　 B. to attend to　　 C. attended to　 D. will attend to

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