The letters for the boss________on his desk but he didn’t read them until three days later. (2012·天津，2)
#99425
A
were put
B
was put
C
put
D
has put
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(2013·安徽合肥二模)—The cars give off a great deal of waste gas in the streets.—Yes. But I'm sure something will be done to ________ air pollution.
#99560
A
reduce
B
remove
C
collect
D
warn
Many a school and many a hospital ______ since 1949.
#103824
A
have set up
B
has set up
C
have been set up
D
has been set up
—I say, Harry. What did you say to the laid-off worker just now? —Nothing. I to myself.
#102852
A
had only talked
B
am only talking
C
have just talked
D
was just talking
Since then the population of London________by almost 50,000 a year—an increase largely fuelled by immigration.
#99680
A
has risen
B
have risen
C
rises
D
rise
Scientists still wonder whether cloning will help or harm us and where it ____ us.
#103545
A
has led
B
is leading
C
had led
D
would lead