Thereisanewprobleminvolvedinthepopularityofprivatecars

問題詳情：

There is a new problem involved in the popularity of private cars ____ road condition need ____ . A. that; to be improved          B. which; to be improved C. where; to be improved        D. when; improving

【回答】

A

知識點：連詞

題型：選擇題