For the sake of enough time for study and rest, students are _____ from using cellphones in our school.
#99311
A
encourged
B
forbidden
C
required
D
kept
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----Have they finished the project?---- Yes. By the end of last month, they ______ it. Now they ______ on a new one.
#101490
A
had finished; are working
B
had finished; work
C
have finished; are working
D
have finished; work
He left his hometown in 1990, and great changes _________ ever since.
#99346
A
had taken place
B
took place
C
have been take place
D
have taken place
It________heavily for 2 weeks and the farmers were very worried.
#99683
A
has been raining
B
had been raining
C
has rained
D
had been rained
Tony ________ for the company as an engineer for two decades. Now he teaches mechanics in Peking University.
#100949
A
has worked
B
worked
C
is working
D
had worked
——I’m sorry , but there’s no smoking on this flight ．——Oh, I _______that ．Sorry , I won’t again ．
#102304
A
don’t know
B
didn’t know
C
won’t know
D
haven’t known