--Look! Somebody       the sofa. --Well, it wasn’t me. I didn’t do it.
#102155
A
is cleaning
B
was cleaning
C
has cleaned
D
had cleaned
推荐题目
Great as Newton was, many of his ideas_____today and are being modified by the work of scientists of our time.
#104460
A
are to challenge
B
have challenged
C
are challenging
D
have been challenged
—I’m going to the States.—How long ________you________ in the States?
#100071
A
are; stayed
B
are; staying 
C
have; stayed 
D
did; stay
I will visit you if Father ______ me.
#101301
A
let
B
lets
C
is letting
D
will let
Our plans for playing the football match today ________ by the terrible typhoon “Soulik”.
#100530
A
have been defeated
B
had been defeated
C
have defeated
D
had defeated