问题
m, You look tired–Yes, I _____________ the room all the afternoon
A:did I see; did I begin to learn
B:I saw; I began to learn
C:I saw; did I begin to learn
D:did I see; I began to learn
B:I saw; I began to learn
C:I saw; did I begin to learn
D:did I see; I began to learn
正确答案是：
