食管癌的典型症状是
A.进食时易哽噎B.进行性厌食C.胸骨后烧灼感D.进行性吞咽困难E.胸背部疼痛
参考答案:D
--- Do you know what Millie and Andy were doing at 8 o’clock yesterday?
--- As Millie_____ TV, Andy _____ the door to welcome Tom.
A.was watching: was opening
B.watched; opened
C.was watching; opened
D.watched: was opening