Scientists ______that bacteria through microscopes for many years．

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问题 Scientists ______that bacteria through microscopes for many years．

选项 A、studied
B、have studied
C、had studied
D、have seen studied

答案B

解析本题考查时态的用法。由于句中已有“for many years”，故应用现在完成时。

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本试题收录于：英语题库成考专升本分类

英语

成考专升本

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Scientists ______that bacteria through microscopes for many years．

英语

成考专升本

Thisletterismostprobablywrittenby.Accordingtothepassage,theboycannotbetaughtto.

Everyonehadan______(apply)forminhishand,butnooneknewwhichofficetosenditto.

NedKelly’sparentswere.NedKellyisacontroversialfigurebecause.

Evenwhenshedidn’tknowwhatshe______about,shespokemoreauthoritativelythanmostpeopledid.

Thenewsthattheherowasinthetown______andeveryonewasexcited.

Thequestion______atthenextmeetingremainsasecret.

______isnotknownwhattheydiscussedinthemeeting.

Inthepast,weneeded______thantoday.

TheSummerPalaceisoneofthe_____parksinBeijingIsuggestyougoingtheretohaveavisit.

Itisthedutyofeverymantowork.Thelifeofalazymanis【21】tohimselfortoothers.Themanwhoistoo【22】toworkisthe

国家实行带薪年休假制度。劳动者连续工作________以上的，享受带薪年休假。()

归经学说的理论依据是

黑膏药制备工艺的关键工序是

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