Be careful when you cross this busy street. ________, you may get run over by a
题型：不详难度：来源：
Be careful when you cross this busy street. ________, you may get run over by a car. | A．If not | B．If so | C．If any | D．If possible |
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答案
| A |
解析
试题分析：考查省略。句意：当你穿过这条繁忙的街道时要小心。如果不小心的话，你可能会被汽车撞到。当if从句的主语跟主句主语一致，且谓语是be的某种形式时，if从句常省略主语和be动词。这里的if not相当于if you are not，故选A。 |
举一反三
“ On no account” , the teacher said, “________ open in day and night. ”| A．the door to the basement is to be left | | B．the door to the basement was to be left | | C．is the door to the basement to be left | | D．was the door to the basement to be left |
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–- Helen, are you going to the airport to see Jack off the day after tomorrow?
-- _____________, I would go.| A．Were he to leave tomorrow | | B．If he was about to leave tomorrow | | C．Was he to leave tomorrow | | D．If he would leave tomorrow |
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On the National Day, up _____ into the air. Then the crowed cheered.| A．the balloons went | B．went the balloons | | C．go the balloons | D．did the balloons go |
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about this computer program, a huge amount of time and energy .| A．Should I know; be saved | | B．If I had known; can be saved | | C．Had I known; would have been saved | | D．Did I know; was saved |
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No sooner______ themselves in their seats in the hall than the speaker began his speech.| A．they settled | B．had they settled | | C．did they settle | D．they had settled |
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