下列计算正确的是[ ]
A.x2·x=x3
B.x+x=x2
C.（x2）3=x5
D.x6÷x3=x2
答案：A
(2013·石家庄市高三二模)—I guess I must leave now. See you tomorrow.
—________！ I have some important information for you.
A．Hang on
B．Never mind
C．All right
D．Take care
The original building was erected in 1710, but this structure has been largely transformed and extended, the present hotel______in 1910.
A．was completed
B．to have been completed
C．having been completed
D．completed
