問題補充：
單選題
Now one of the most serious problems many people are worried about _____ on the lack of adequate housing spaceA.insistsB.dependsC.agreesD.focuses
網(wǎng)友答案：
熱心網(wǎng)友 1樓
D解析考查動詞：這些動詞都可以和on搭配，A. insists堅持，B. depends 依賴 C. agrees同意 D. focuses專注，句意：現(xiàn)在很多人擔心的最嚴重的問題重點在房屋空間缺少上。選D。
