They ___________ for two hours 
#102329
A
is working
B
worked
C
have been working
D
had worked
推荐题目
Mother wanted to be a good provider, a role she ______ since her marriage to Father.
#101143
A
shoulders
B
shouldered
C
is shouldering
D
has been shouldering
Mother blamed the dog for breaking the glass, but in fact I _____.
#103293
A
was to be blamed
B
is to be blamed
C
was to blame
D
is to blame
A highway bridge ______over the river. They hope to finish it next month.
#101922
A
was built
B
is built
C
has been built
D
is being built