求以下几题的英语答案单选题41.The police found that the house _____ and a

求以下几题的英语答案
单选题
41.The police found that the house _____ and a lot of things ______.
A has broken into; has been
stolen
B had broken into; had been
stolen
C has been broken into;
stolen
D had been broken into;
stolen
单选题
42.If they _______ the contract ahead of time,they could not have
missed the plan.
A signed
B had signed
C would have signed
D should
sign
单选题
43.The dictionary _____ he paid 50 yuan for is very useful.
A which
B for which
C on which
D about
which
单选题
44.If we _____ yesterday,we ______ the work.
A weren't interrupted..,
would finish
B didn't interrupt..,would
have finished
C hadn't been
interrupted..,would have finished
D hadn't interrupted..,
would have finished
单选题
45.—Can I help you?Are you looking for anything in particular today?
—_________We’re just looking.
A Yes please
B No,thank you
C Yes,you can
D No,you
needn’t
单选题
46.I made a call to my parents yesterday.To my disappointment,_____
of them answered it.
A either
B none
C neither
D nobody
单选题
47.It _____ Mike and Mary who helped the old man several days ago.
A was
B are
C were
D had been
单选题
48.The policeman’s attention was suddenly caught by a small box which
______ placed under the Minister’s car.
A has been
B was being
C had been
D would be
单选题
49.A library with five thousand books _____ to the nation as a
gift.
A is offered
B has offered
C are offered
D have
offered
单选题
50.Tom,you’re too lazy!The work _____ have been finished
yesterday.
A would
B should
C must
D could

41.D
42.B
43.B
44.C
45.B
46.C
47.A
48.B
49.A
50.B