Who _____ over there now？
A. singing
B. are sing
C. is singing
D. sing
查看答案
本病患者治疗首选药物是
A. 阿司匹林
B. 硫唑嘌呤
C. 环磷酰胺
D. 泼尼松
E. 氯喹
The meeting _____when Mr. Wang _____to school.
A. has begun; get
B. has been on; get
C. had begun; got
D. had been on; got
Susan told me she _____lunch, so she was very hungry.
A. has had
B. hasn' t have
C. have had
D. hadn' t had
The bus had gone when I ____ at the bus stop.
A. have arrived
B. arrived
C. had arrived
D. am arriving
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