Since the opening and reform policy, China    a boom in its economy.
#102286
A
enjoys
B
has been enjoying
C
enjoyed
D
having enjoyed
推荐题目
 We won’t start the work until all the preparations __________.
#99078
A
are being made
B
will be made
C
have been made
D
had been made
When and where to build the new factory ___ ________ yet.
#102038
A
is not decided
B
are not decided
C
has not decided
D
have not decided
I’ll come after the meeting if time ______. 
#104198
A
permits
B
is permitting
C
is permitted
D
has permitted