单选题 It______ on Fred that he would fail the course if he did not study harder.

A、 dawned
B、 hit
C、 struck
D、 occurred

【正确答案】 A

【答案解析】解析：dawn on／upon sb．(以事物作主语，以人作宾语)明白过来，想到(如：It has slowly dawned upon us that he will not help．It suddenly dawned upon me why he was so interested in my story)