(2014·湖南六校联考)I know it’s normal for such a thing to happen，but we________it if we’d been more careful.
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A
need have avoided
B
could have avoided
C
will have avoided
D
had avoided
推荐题目
Most people advise that students’ heavy burden __________.
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A
reduce
B
be reduced
C
to be reduced
D
reduced
-- Do you still remember when we went to Nanjing?--- I can’t remember now but _________ sometime last summer?
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A
might it be
B
could it be
C
could it have been
D
should it have been
(2013·江西南昌一模)Why ________ it get colder when we climb up a mountain? We are getting nearer to the sun!
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A
ought to
B
would
C
should
D
must