________ a certain doubt among the people as to the practical value of the project.
#99564
A
It has
B
They have
C
It remains
D
There remains
推荐题目
Pompeii _______ by so many tourists that some of the relics are not well protected. 
#102918
A
has been visited
B
is visited
C
is visiting
D
was visited
The managers consider it is important that everything ________ by weekend.
#99612
A
will complete
B
has completed
C
be completed
D
is completing
 They _______ when they heard him confess his fault.
#104169
A
had been surprising
B
were surprising
C
were surprised  
D
had been surprised