I won"t go _____ he comes back. [ ]A. until B. while

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I won"t go _____ he comes back.           [     ]
A. until
B. while
C. when
D. why

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举一反三

We can"t do well in examinations          we study hard in school time.[     ]
A. if
B. and
C. since
D. unless

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Don’t get off the bus          it has stopped.              [     ]
A．until
B．if
C．to
D．at

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It"s clear         it"s going rain.              [     ]
A. that
B. which
C. when
D. what

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My brother and I look different            we are twins.            [     ]
A. though
B. because
C. but
D. then

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

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