问题

About 10 million dolphins are said ________ in the past 15 years.
A:to have killed
B:to kill
C:to have been killed
D:to be killed;
B:to kill
C:to have been killed
D:to be killed;
正确答案是:
同类题型
Paul’s wish is to become a pilot, ________
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You had better not throw_____old things. We should send them to the people in need.
I’ve got so many problems _______ today that I’mafraid I won’t have time to have lunch.