试题 试卷
题型：单选题 题类：常考题 难易度：普通
—I think it is Mary's. _______ is red.
— Once a month.
—It's more than 1.3 billion.
{#blank#}1{#/blank#} {#blank#}2{#/blank#}he{#blank#}3{#/blank#} to visit his aunt last week?
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