Cars play an important role in modem life, but they also cause many proble
题型：不详难度：来源：
Cars play an important role in modem life, but they also cause many problems like air pollution.| A．should | B．can | C．must | D．will |
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答案
| B |
解析
| 考查情态动词。句意：小汽车在现代生活中起着重要的作用，但它们也可能引起像污染等许多问题。故用情态动词can，选B。 |
举一反三
After her son’s death, the old lady _____ sit at the window, deep in thought．| A．would | B．should | C．could | D．might |
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This camera is of good quality. If it ______ break down within the first year, we would repair it at our expense. | A．would | B．should | C．could | D．might |
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He said he didn’t regret telling the truth but felt that he ______ it differently. | A．could have expressed | B．could express | C．must have expressed | D．would express |
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—Yao Yuan, a disabled woman, won the National Championships Cup last week.
—My goodness! She _______a lot of difficulties!| A．may go through | B．might go through | | C．must have gone through | D．ought to have gone through |
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– Mary was crying sadly.
-- Oh, she ________ the bad news that her mother was badly injured in the accident.| A．must know | B．might have known | C．must have known | D．should have known |
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