【单选题】【消耗次数：1】
He is a teacher and so [填空] his wife.
①
does
②
is
③
do
④
did
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<img class="kfformula" src="20200629/1593440389481023.png" data-latex="{SO}_{2}" width="43" height="35"/>通入石蕊试液中使之变红
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