优优班--学霸训练营 > 知识点挑题
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            • 1. -When did the tsunami hit Indonesia?
              -It was on 26th December        the concert was being held.(  )
              A.that
              B.while
              C.before
              D.when
            • 2.
              The boss of the company is trying to create an easy atmosphere __________ his employees enjoy their work.(  )
              A.where
              B.which
              C.when
              D.who
            • 3.
              Look out! Don’t get too close to the building ______ roof is under repair.
              A.whose
              B.which      
              C.of which       
              D.what
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