Jack was halfway back to the village where his mother lived _____ Mary caught up with him.
A．whenB．whileC．untilD．though
A
考察連詞用法。When在那時(shí)（并列連詞）；while當(dāng)…時(shí)（從屬連詞）；結(jié)合句意可知A正確。句意：Jack正在回他媽媽工作的村莊的半路上，在這時(shí)Mary趕上他了。
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