—Where is Tom? I can't find him.        

—He ________in the classroom now.          [ ]

A. may be        

B. maybe          

C. willbe        

D. was

肺静脉畸形引流，无下列哪项征象（）

A.肺血增多

B.右心房、室增大

C.肺动脉段突出

D.雪人征

E.左心室增大