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keep_______pressing that red betton if there is no pictures

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keep
_______pressing that red betton if there is no pictures on the machine
A keep B to keep C Keeping D Kept
能说明理由和解释吗
keep_______pressing that red betton if there is no pictures
keep
_______pressing that red betton if there is no pictures on the machine
这个句子主句缺一个动词
keeping 不是动词
kept 不用过去式
to keep 表目的 如果选D就是 主句就是 为了能按红色按钮 所以错