请选择ABCD:O4?'o7t.C4a(t)| __________look__________the blackboard./x;\;z)`5f+U8T)K5\
A.Let, at/x;\;z)`5f+U8T)K5\
B.Let' s, at/x;\;z)`5f+U8T)K5\
C.Lets, like/x;\;z)`5f+U8T)K5\
D.let, on/x;\;z)`5f+U8T)K5\