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Once there was ______time _____people walked without shoes.
A．a ;thatB．a ;whenC．the ;thatD．the ;that
B
考察冠詞及定語從句,句意:曾經有一段時間人們走路不穿鞋.結合語境可知前文泛指任何一段時間,故用不定冠詞,根據先行詞time時間,可知引導詞用when,故選B.
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