Question

【题目】She often buys her father a cake when his birthday (come).

Answer 1

【答案】comes
【解析】句意：她经常给爸爸买蛋糕，当他的生日来临时。根据句意可知这个动作是经常性的，故用一般现在时，从句主语是his birthday三单，故动词用三单形式，变为comes。