– Why you didn’t handed in your exercise paper?–Sorry, but I ____ that it should be turned in today.
#100688
A
didn’t know
B
hadn’t known
C
haven’t known
D
don’t know
推荐题目
You ____ television.Why not do something more active?
#102877
A
always watch
B
are always watching
C
have always watched
D
have always been watching
Tom was badly injured in the accident last week. A new manager____ to take his place since then. 
#99361
A
has been arranging
B
has arranged
C
was arranged
D
has been arranged
Every means ______ tried, yet no result ______encouraging up to now.
#103827
A
have been ...is
B
has been...has been
C
have ...has been
D
has...is