问题补充：
---Sorry, I don’t know what the teacher said just now.
----He asked Maria .
A. how long she usually spends on her homework
B. what she was doing these days
C. why didn’t Mike come to the meeting yesterday
D. when the speech will begin
答案：
A. how long she usually spends on her homework
(答案→)B. what she was doing these days
C. why didn’t Mike come to the meeting yesterday
D. when the speech will begin
解析：句意：对不起，我不知道老师刚刚说什么了。他问玛利亚这些天在做什么？主句用asked表示一般过去时，所以从句要用过去的相应时态，并且宾语从句中要用陈述句语序。故选B
