The country has already sent up 3 unmanned spacecraft, the most recent        at the end of last March.
A.was launchedB.being launched
C.has been launchedD.having been launched
D

試題分析:考查獨立主格結(jié)構(gòu):此句前后句沒連詞,只有逗號是不能連接兩個句子的,所以后邊the most recent ______ at the end of last March就是獨立主格的形式了,在句中做伴隨狀語,the most recent和launch是被動關(guān)系,而且是去年三月已經(jīng)被發(fā)射了,用現(xiàn)在分詞完成式的被動式。句意:中國已經(jīng)發(fā)射了3顆無人飛船,最近在去年的三月已經(jīng)被發(fā)射。選D。
點評:獨立主格結(jié)構(gòu)是高考的難點,很多學(xué)生感到有困難,關(guān)鍵是學(xué)會分析句子成分,兩句話沒有連詞又不是定語從句,就是獨立主格結(jié)構(gòu):邏輯主語+非謂語動詞/名詞/adj/adv/介詞短語。
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