问题
________ the failed experiences, you would not havemade such a mistake in your homework.
A:refer to
B:have referred to
C:referred to
D:had referred to;
B:have referred to
C:referred to
D:had referred to;
正确答案是：
同类题型
The question that puzzled them is ____ they can get rid of the air pollution in the area.
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