______ it have been the failure to pick up directions from the ground control that caused the air crash?
| A．Must | B．Could | C．Would | D．Should |
相关试题
Since I bought the book two weeks ago, I ______ hardly ______ time to open it, just because of the research paper.
| A．have; had | B．did; have | C．have; any | D．had; any |
As is widely accepted, _______ students should have ______ easy access to labs, libraries and other facilities at school.
| A．/; an | B．the; an | C．the; / | D．/; / |
---Peter was killed in the earthquake!
---_____ I talked with him last week.
| A．What a pity! | B．I beg your pardon. | C．Sorry to hear that. | D．Is that so? |
It was along the Mississippi River ______ Mark Twain spent much of his childhood _____ the story happened.
A. which; that B. that; which C where; that D. that ;that
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