She promised her parents to write ______ while she was away. A. the other day B. each other day C. e

She promised her parents to write ______ while she was away. A. the other day B. each other day C. every other day D. any other day

正确答案是 C. every other day。

解析：

语境理解：句子意思是“她向父母承诺在她外出期间会______写信。”这里需要填入一个表示“每隔一天”的短语。

选项分析：

A. the other day：意思是“前几天”或“那天”，表示过去的某个时间点，不能填入此处。

B. each other day：没有这种说法，属于语法错误。

C. every other day：固定搭配，意为“每隔一天”，符合句意。

D. any other day：意思是“任何其他一天”，无法表达有规律的间隔含义，不符合承诺的语境。

搭配逻辑：她承诺“每隔一天”写信，强调规律的频率，这是最自然合理的表达。

因此，最佳答案是 C。

完整句子：
She promised her parents to write every other day while she was away.