It is difficult for us to learn a lesson in life __________ we"ve actually had t

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It is difficult for us to learn a lesson in life __________ we"ve actually had that lesson.[ ]
A. when
B. after
C. since
D. until

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举一反三

—When did John start writing music?
—______ he was in his middle school.[     ]
A. Until
B. When
C. Because
D. So

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He didn"t pass the exam _____ he had studied harder.[     ]
A. because
B. but
C. even if
D. if

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I like music ________ it"s very relaxing.    [     ]
A. but
B. and
C. because
D. or

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-Why do you like dogs?
-__________ they are very friendly.[ ]
A. Because
B. But
C. And
D. Or

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A tourist will easily lose his way in Beijing _________ he has a map or a guide.[     ]
A. if
B. because
C. unless
D. when

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