单项选择题
A.focuses
B.concentrates
C.centers
D.emphasize
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单项选择题
A.butB.soC.thenD.since
A.but
B.so
C.then
D.since
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单项选择题
A.waverB.hesitateC.hasteD.stop
A.waver
B.hesitate
C.haste
D.stop
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