A. | Unless | B. | Until | C. | As | D. | While |
分析 隨著人口平均年齡的增長,越來越多的老人需要照顧.
解答 答案C.
A.unless,表示除非;B.until 表示直到…為止;D.while 當(dāng)…時.
干擾項D項while 引導(dǎo)時間狀語從句,表示"當(dāng)…時",動詞為延續(xù)性動詞,表示持續(xù)的動作,強調(diào)狀態(tài).如,While I'm driving,I always listen to the radio.
as 引導(dǎo)的從句的動作和主句的動作通常是同時發(fā)生變化,有伴隨的意味;而while沒有這種意味.a(chǎn)s引導(dǎo)時間狀語從句,表示動作發(fā)生的背景和前提條件,且從句中的動作和主句中的動作是同時發(fā)生,從句的動詞通常為延續(xù)性動詞.根據(jù)本句句意,表示"隨著",應(yīng)為as.故選C.
點評 本題需要掌握as引導(dǎo)時間狀語時的使用.
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