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            • 1． The policeman's attention was suddenly caught by a small box which ______  placed under
              the Minister's car.

              A. has been
              B. was being
              C. had been
              D. would be
              难度：中等
              解析 收藏 试题篮
            • 2．
              Experiment of this kind _____ in both the U.S. and Europe well before the Second World War.

              A. have conducted
              B. have been conducted
              C. had conducted
              D. had been conducted
              难度：较易
              解析 收藏 试题篮
            • 3．
              — George and Lucy got married last week. Did you go to their wedding?
              — No, I _____. Did they have a big wedding?

              A. was not invited
              B. have not been invited
              C. hadn't been invited
              D. didn't invite
              难度：中等
              解析 收藏 试题篮
            • 4．
              At the end of the meeting, it was announced that an agreement ______.

              A. has been reached
              B. had been reached
              C. has reached
              D. had reached
              难度：中等
              解析 收藏 试题篮
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