问题
I wonder _______. He seems to be very worried.— His favourite pen has gone missing and he is looking for it around the school.
A:what’s wrong with Mike
B:when Mike came to school
C:who Mike talked with yesterday
D:how Mike came to school this morning;
B:when Mike came to school
C:who Mike talked with yesterday
D:how Mike came to school this morning;
正确答案是：
