While __________ for the bus, I happened to come across my childhood friend, Tom.
A．waitedB．waitC．waitingD．to wait
C

試題分析：考查狀語從句的省略式，當(dāng)主從句的主語一致時，要省略從句的主語和be動詞，while waiting="while" I was waiting，句意：當(dāng)我在等公共汽車的時候，碰巧遇到兒時的朋友，湯姆。選C。
點(diǎn)評：此類題目可以使用還原法做題，也可以當(dāng)成非謂語動詞做，考慮主語和動詞的關(guān)系。
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