I always forget my umbrella _____________ a rainy day. [ ]
A. in
B. at
C. on
D. to
答案:C
肺部叩诊实音不出现于()
A.肺不张
B.肺空洞
C.胸腔积液
D.胸膜肥厚
E.胸壁水肿
Don’t eat ________class.
A. at B. in C. to