If the economy gets worse, we shall have to (tightly) ______ our belts.

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问题 If the economy gets worse, we shall have to (tightly) ______ our belts.

选项

答案tighten

解析 根据句子结构可以看出have to后需要一个动词来做谓语,tightly的动词为tighten,意为“使……变紧,使……变得更紧”。
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