Having lost his key，________.
A．he couldn’t enter the roomB．the gatekeeper offered to help
C．the door was forced openD．the room couldn’t be entered
A

試題分析：考查句子結(jié)構(gòu)：逗號前面是現(xiàn)在分詞的完成式做狀語，說明句子的主語應(yīng)該是lost his keys的邏輯主語，應(yīng)該是he，句意：丟了鑰匙后，他不能進入房間。選A。
點評：用非謂語動詞做狀語，說明主從句的主語一致的時候，做題時可以在四個選項中找非謂語動詞的邏輯主語，往往邏輯主語對了，答案就自然出現(xiàn)了。
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