题目内容
There is a new problem involved in the popularity of private cars________road conditions need________.
| A.that;to be improved | B.which;to be improved |
| C.where;improving | D.when;improving |
A
考查同位语从句和固定词组。Need doing="need" to be done需要做某事;同位语从句conditions need________.解释名词a new problem
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