about ten dollars are enough有什么错没?

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• about ten dollars are enough有什么错没?
• about ten dollars are enough有什么错没?
• 时间状语从句与强调句的区别—______ that she met her friend,whom she hadn’t seen for ten years?—It was at about 12 noon ______ she wandered aimlessly around the streets..A.How was it; when B.Why was it; thatC.Where was it; that D.When was it; when 搞不懂,回答的那句有“at”,去掉It was 加一空成分不是完整的吗?为什么用when?我觉得最好的答案是When was it; that,但是没这个选项啊...
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