—Those scientists invented a robot to care for kids! —It’s not surprising．They ____ wonders all the time．
#103461
A
worked
B
were working
C
work
D
have been working
推荐题目
These days, we _____ for our final exams.
#102111
A
are prepared
B
have prepared
C
are preparing
D
will prepare
In the past decades, sea ice _____in the Arctic as a result of global warming.
#102142
A
had melted
B
has been melting
C
melted
D
is melting
─Are you going to plant a great many trees in this area? ─Yes. The soil _________ away in this way.
#103061
A
doesn’t wash
B
won’t wash
C
isn’t washed
D
won’t be washed
—Brandon, do you know who wanted me on the phone?—Sorry. I don’t know. I ________ a bath in the bathroom.
#104471
A
have had
B
was having
C
had
D
am having
I could have offered you some help last weekend, but I _______ with my work at that time.
#100642
A
would be occupied
B
was occupying
C
had been occupied
D
was occupied