高中英语现在完成时时态笔记重点大全
单选题(经典例题高频考点-名师出品必属精品)
1、The researchers ______ till midnight every day since the outbreak of the disease to find an effective cure.
A.work
B.will work
C.are working
D.have been working
答案:D解析:考查时态语态。句意:自从疫情爆发以来
,研究者每天都忙到深夜以找到有效的治愈方法。时间状语
since the outbreak of the disease
提示用完成时态
, till midnight
表示动作的持续性
,故用现在完成进行时
,故选D。2、I ________ my homework for four hours, but I am not sure whether I can hand it in tomorrow.
A.have done
B.have been doing
C.had been doing
D.had done
答案:B解析:考 ...


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