— Where’s Lucy ? —  She ________ in the office. I saw her there just now.A.can’t

— Where’s Lucy ? —  She ________ in the office. I saw her there just now.A.can’t

题型:不详难度:来源:
— Where’s Lucy ? —  She ________ in the office. I saw her there just now.
A.can’t beB.must beC.can beD.should be

答案
B
解析

试题分析:英语中有些情态动词,通过使用不同的时态形式,可以表示“推测”的含义。1. 情态动词 + 动词原形:must + 动词原形,表示对现在的事实进行非常有把握的推测,一般用于肯定句。如:There must be something wrong. 一定是出了什么差错。may / might / can / could + 动词原形,表示对现在、未来事情发生的可能性的推测。此时, might, could 不表示过去,只是表示推测的语气更加不肯定。一般情况下, may, might 用于肯定句中; can, could 用于否定句、疑问句中。根据语境可知Lucy肯定在办公室,因为刚才在办公室里看到过她,表示肯定,故选B。
点评:关于表示推测的情态动词后面所接动词形式,有下列三种情况:若对此刻正在发生的事,接“be +现在分词”;若对现在或未来情况的推测,接动词原形;若对过去情况的推测,接“have +过去分词”。
举一反三
---Fifty dollars for such a T-shirt! You _______ be joking!
---I’m serious.It’s made of silk.
A.mustB.needC.mayD.Can

题型:不详难度:| 查看答案
–Look at that red bike, it _____ belong to you. I have seen you ride it.
--But it ____ be mine. Mine is broken. I am having it repaired.
A.may, can’tB.must, mustn’tC.may, mustn’tD.must, can’t

题型:不详难度:| 查看答案
---I don’t want to go to school on foot. What should I do?
---You          try asking your father for a bike, or you can go by bus.
A.have toB.mustC.mightD.can’t

题型:不详难度:| 查看答案
—Must I finish the homework tonight?
—No, you        .You can finish it tomorrow.
A.mustn’tB.needn’tC.need D.must

题型:不详难度:| 查看答案
Someone is knocking at the door. It     my sister. It"s time for her to be back.
A.can’t beB.may not beC.must beD.mustn’t be

题型:不详难度:| 查看答案
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