Tomhasbeenavegetarian____principleforyears.
A、inB
【句意】 多年來，湯姆一直是一個按原則行事的素食者。
【難點】 on principle意為“根據行為準則;按照原則”;in principle 意為“原則上;基本上;大體上”。for和by不與principle搭配。
It’snecessary_________usallto________
Thereasonthathispropertywasconfiscatedbythecountry,it____,wasthathewasinvolvedinalotoffraudulentactivitiesduringthewar.
Mrs.Whitehas_____thatsheisnotabletogetajob.
Physicsisthepresentdayequivalentof____usedtobecallednaturalphilosophy,from____mostofpresentdaysciencearose.
Dr.Yangworked______threedaysago.
