Sarah says that she will visit us in the summer but I can’t her to

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问题 Sarah says that she will visit us in the summer but I can’t ______ her ______ to a definite date.

选项 A、nail... down
B、tie... up
C、pin... on
D、fasten... in

答案 A

解析 nail down的意思是“准确解释，确切说明”，符合本题的题意。整个句子的意思是：“萨拉说今年夏天来看我们，但是我还不知道她来的确切日期。”其他三个选项均不适合本题的题意：tie up 意为“系紧；捆绑”；pin on意为“把……归咎于”；fasten in意为“收紧；锁上”。

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Sarah says that she will visit us in the summer but I can’t ______ her ______ to