问题
The world today _____ different without the amazing discoveries produced by great scientists.
A:were
B:had been
C:would be D.would have been;
D:would have been;
B:had been
C:would be D.would have been;
D:would have been;
正确答案是：
同类题型
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listener takes part in the conversation,offering ideas and ___ questions to keep the talk flowing.