填空题sleep,just like esting,toileting and dressing is a daily habit that __(requirement) regular training before it becomes properly established.

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填空题sleep,just like esting,toileting and dressing is a daily habit that __(requirement) regular training before it becomes properly established.

填空题sleep,just like esting,toileting and dressing is a daily habit that __(requirement) regular training before it becomes properly established.
填空题sleep,just like esting,toileting and dressing is a daily habit that __(requirement) regular training before it becomes properly established.

填空题sleep,just like esting,toileting and dressing is a daily habit that __(requirement) regular training before it becomes properly established.
requires
真正的主语是sleep,just like esting,toileting and dressing 作同位语,因此动词用三单形式.

应该是 is required

requires 需要