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AgoodfriendalwaysAgoodfriendalwaysgivesyouahelpinghandyou'reintrouble.[]A.whenB.beforeC.untilD.though

题目详情
A good friend always
A good friend always gives you a helping hand _____ you're in trouble.       [     ]
A.when                      
B.before                      
C.until                      
D.though
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答案和解析
A