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            • 1． --- Why didn"t you help the little boy？
              --- Oh， he had struggled to his feet ______ I could run over and offered any help．（　　）
              A．before
              B．after
              C．when
              D．since
              难度：中等
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            • 2． _________ fighting world hunger continues to be the matter of vital importance，more people now die from being overweight than from being underweight．（　　）
              A．While
              B．If
              C．Unless
              D．Once
              难度：中等
              解析 收藏 试题篮
            • 3． ______ _________ ______ it ended , more than 700 people had been killed and 2700 had been injured.(by)
              难度：中等
              解析 收藏 试题篮
            • 4．

              — How long do you suppose it is ________ he arrived here?

              — At least three hours.

              A．since   
              B．before   
              C．after   
              D．when
              难度：中等
              解析 收藏 试题篮
            • 5．

              They had walked in wrong directions for quite some time ________ they realized that they had got lost.

              A．since   
              B．while   
              C．before   
              D．after
              难度：中等
              解析 收藏 试题篮
            • 6． The famous pop singer was going out       he found himself surrounded by lots of young people．（　　）
              A．when
              B．before
              C．while
              D．after
              难度：中等
              解析 收藏 试题篮
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