He is always clever. I wonder how it_____that he should have failed the simple test this time.A.came aboutB.came overC.came upD.came out
参考答案：
A解析句意：他一向很聪明。我很奇怪他竟然没有通过这次简单的考试。come about发生；come over过来；顺便走访；come up上来；被提出；come out出来；出版；显现。根据题意，只有C项正确。
