问题标题：
1.Therearefivepairs____,butI'matlosswhichtochoose.AtobechosenBtochoosefromCtochooseDforchoosing2.Aftersheconsideredtheproblem,shegotatallboxtostand_____.AbyBonCupDwith3.CharlesBabbageisgenerallyconsidered______the
问题描述：
1.Therearefivepairs____,butI'matlosswhichtochoose.
Atobechosen
Btochoosefrom
Ctochoose
Dforchoosing
2.Aftersheconsideredtheproblem,shegotatallboxtostand_____.
Aby
Bon
Cup
Dwith
3.CharlesBabbageisgenerallyconsidered______thefirstcomputer.
Atoinvent
Binventing
Ctohaveinvented
Dhavinginvented
4.'WhereisDavied?""Heisupstairs____readytogoout."
Atoget
Bgetting
Ctobegetting
Dhavinggot
5.Withalotofdifficultproblems_____,thenewly-electedpresidentishavingahardtime.
Asettled
Bsetting
Ctobesettled
Dbeingsettled
6.Ifthecarwon'tstart,____it.
Atrypush
Btrypushing
Ctrytopush
Dtotrypushing
南国芳回答：
1Btochoose(one)fromthefivepairs中的from是指从中选2B句意是站在盒子上,故用standon3Ctohaveinvented是不定式的完成式,表明动作发生在谓语动词动作isconsidered之前.4B现在分词作伴随状语.5...
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