—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
．Although it in the desert most of the year, people still live there．
#102773
A
doesn’t rain
B
didn’t rain
C
hasn’t rained
D
hadn’t rained
---How long ____ you ____ in Singapore?---For just the weekend． I’ll be back next Monday morning．
#103145
A
have; stayed
B
are; staying
C
did; stay
D
do; stay
―Twenty dollars, please!― How terrible!―I ________ to bring my wallet with me.
#104499
A
was forgetting
B
forgot
C
had forgotten
D
am forgetting
It long before we the result of the experiment．
#102004
A
will not be；will know
B
is；will know
C
will not be；know
D
is; know
—Why do you look so worried? —My computer broke down and my essay ______ unfinished since.
#102209
A
had left
B
has left
C
was left
D
has been left