问题标题：
【1.Theunemploymentrateinthisdistrict________from6%to5%inthepasttwoyears.A.hasfallenB.hadfallenC.isfallingD.wasfalling2.-Nancyisnotcomingtonight.-Butshe____________!A.promisesB.promisedC.willpromiseD.hadpromised3.Ithinkm】
问题描述：
1.Theunemploymentrateinthisdistrict________from6%to5%inthepasttwoyears.
A.hasfallenB.hadfallenC.isfallingD.wasfalling
2.-Nancyisnotcomingtonight.
-Butshe____________!
A.promisesB.promisedC.willpromiseD.hadpromised
3.Ithinkmyfatherisahero.Heisnotonlystrict____usbutalsostrict_____hiswork.
A.on;inB.with;inC.in;aboutD.with;on
4.I_______whilereadingtheEnglishtextbook.Luckily,myroommatewokemeupintime.
A.hadfallenasleepB.havefallenasleep
C.fellasleepD.fallasleep
胡铁松回答：
1.Ainthepasttwoyears表明这是现在完成时
2.B相对与她今晚她的承诺是过去发生的
3.Bbestrictwithsb对人严格
bestrictinsth对事情严格
4.cwhile引导的从句用过去进行时,省略了Iwas,主句用过去式.
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