—Has Tom finished his experiment today? —No idea. He______it this morning.

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问题 —Has Tom finished his experiment today? —No idea. He______it this morning.

选项 A、is doing
B、was doing
C、had done
D、has done

答案B

解析句意：——汤姆今天完成实验了吗?——不知道，他今天上午一直在做。本题考查的是时态的用法。根据题意，题目表达的是Tom今天上午一直在做，需用过去进行时，故B正确。

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本试题收录于：公共英语二级笔试题库公共英语（PETS）分类

公共英语二级笔试

公共英语（PETS）

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—Has Tom finished his experiment today? —No idea. He______it this morning.

公共英语二级笔试

公共英语（PETS）

Where,doestheconversationmostprobablytakeplace?

Christmasistraditionallycelebratedon.ThetopofaChristmastreeistraditionallydecoratedwith.

Whichagegroupdothetwospeakersmostlikelybelongto?

Thepassageismainlytalkingabout______.

PluggingintoElectronicDatabasesIfyouarelooking【C1】information,libraryshelvesareagoodplace【C2】.Buti

PeoplelivingonpartsofthesouthcoastofEnglandfaceaseriousproblem.In1993,theownersofalargehotelandofseveral

Sept.10thWednesdayFineTodayisTeacher’sDay.Iattendedacelebration【M1】______meetingholdbyourschool.A

Ifsomeoneasksyouhowyoucanmakeyoualways【76】______happyyouwillperhapsfindratherdifficulttogivehim

Dolphinsareinterestinganimals.Workingwiththemisfun,becauseyouneverknowwhattheywillcomeupwithtosurpriseyou.

易感儿接触麻疹病人后接受被动免疫，隔离期为

不属于小细胞性贫血的是

设函数z=3x+y2，则dz=________．

发行人()，应说明其与公司未来发展战略的关系。

证券投资基金的营销渠道有直销和代销两类渠道。()

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