I tied the tree to the top of the stick ___it was straight .[ ]A. in order

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I tied the tree to the top of the stick ___it was straight .[ ]
A. in order to
B. for
C. so that
D. but

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举一反三

The child didn"t go to bed ___________ her mother came back.       [     ]
A. when
B. until
C. after
D. as

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I arrived at the airport _____the plane had taken off.  [     ]
A. after
B. while
C. when
D. before

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_____the water was cold , Wei Qinggang jumped into it to save others.[ ]
A. Although
B. When
C. If
D. Because

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_____ you work hard,you will pass the exam．    [     ]
A. Where
B.  If
C.  Because
D.  When

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—What do you think of the concert given by the young pianist?
—It"s excellent, _____ one piece of the music wasn"t played quite well.       [     ]
A. and
B. even though
C. because
D. so that

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