The Smiths did ______ best to make us feel at home.

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问题 The Smiths did ______ best to make us feel at home.

选项 A、his
B、their
C、them
D、they

答案B

解析 do one’s best(尽力)为固定词组。one’s随主语人物的数的变化而变化,the Smiths表示一家人,应用复数形式。
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