问题标题：
1___theremanytreesonthecampus?no,butnowwehavemanyeverythere.a,wereb,hadc,didhave2we__inthesea,thewaterwastoocold.a,swamnotb,didn'tswimc,didn'tswam3__theteacher__atthiscollegelastyear?yes,hedid.a,didtaughtb,doestea
问题描述：
1___theremanytreesonthecampus?no,butnowwehavemanyeverythere.
a,wereb,hadc,didhave
2we__inthesea,thewaterwastoocold.
a,swamnotb,didn'tswimc,didn'tswam
3__theteacher__atthiscollegelastyear?yes,hedid.
a,didtaughtb,doesteachc,didteach
4Prof,Green__sickyesterday.he__afever.nowhestillsfeelweak.
a,ishasb,washavec,washad
杜小振回答：
1A2B3C4C
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