All flights _____because of the snowstorm,we decided to take the train instead.
A.were canceled B.had been canceled
C.having canceledD.having been canceled
D

試題分析:本題考查獨(dú)立主格結(jié)構(gòu)。根據(jù)句子結(jié)構(gòu),空格應(yīng)填非非謂語動詞,排除AB,其邏輯主語為All flights,而句子的主語是we,因此是考查獨(dú)立主格結(jié)構(gòu),flights與cancel之間為被動關(guān)系,故選D。若選B,則題目應(yīng)變成when引導(dǎo)的時(shí)間狀語從句
點(diǎn)評:獨(dú)立主格結(jié)構(gòu)由兩部分組成,前一部份是名詞或者代詞,后一部分是非謂語動詞(不定式、動名詞和分詞)或形容詞、副詞、或介詞短語。前后兩部分具有邏輯主謂關(guān)系。獨(dú)立主格結(jié)構(gòu)在句中做狀語,多用于書面語。獨(dú)立主格結(jié)構(gòu)本身不是句子,在句子中作狀語,表示時(shí)間、原因、條件、伴隨、目的等邏輯主語+非謂語動詞。
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