Mothers can be seen leaving supermarkets with trolleys piled high with "junk food". Their families are eating far more calories

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问题 Mothers can be seen leaving supermarkets with trolleys piled high with "junk food". Their families are eating far more calories than______good for them.

选项 A、is
B、are
C、that is
D、those are

答案B

解析 than是关系代词,代替第二个比较句的主语calories,所以谓语应为复数are。也可以把than看成连词,后一个句子主语省略了。D中those替代calories,但缺少起连接作用的which或that。is和that is在数量上不对。
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