It’s very informal here, you ______ wear a tie unless you want to.

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问题 It’s very informal here, you ______ wear a tie unless you want to.

选项 A、don’t have to
B、must not
C、could not
D、may not

答案A

解析 don’t have to不一定非要怎么样。这里不是很正式,除非你想系,你不一定非要系领带。
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