用needn't to或didn't have to或didn't need填空：Then the frogs thought that they ( ) go any further.

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用needn''tto或didn''thaveto或didn''tneed填空：Thenthefrogsthoughtthatthey()goanyfurther.用needn''tto或didn''thave

用needn't to或didn't have to或didn't need填空：Then the frogs thought that they ( ) go any further.
用needn't to或didn't have to或didn't need填空：Then the frogs thought that they ( ) go any further.

用needn't to或didn't have to或didn't need填空：Then the frogs thought that they ( ) go any further.
needn't表示need此时为情态动词,后面直接加动词原形不用加to,所以错误
didn't need此时need为实义动词,后面应该加to,所以错误
本空应该填didn't have to意为“不必要”

didn't have to