The singer and the dancer ____ come to the meeting. [ ]
A. has
B. have
C. are
D. is
答案:B
混凝土的自然养护温度应( )℃。
A.高于20
B.不低于20
C.低于5
D.不低于5
He must have ________ the funny story. I can’t believe that it’s true.
A.picked up
B.turned up
C.done up
D.made up