问题补充:
I you, but I was busy all the time yesterday afternoon.
A. could help
B. had helped
C. helped
D. could have helped
答案:
A. could help
B. had helped
C. helped
(答案→)D. could have helped
解析:英语中,“情态动词 + 完成时”表示“本来……”,讲过去的情况。could have helped:本来能帮助
时间:2021-03-28 08:19:41
I you, but I was busy all the time yesterday afternoon.
A. could help
B. had helped
C. helped
D. could have helped
A. could help
B. had helped
C. helped
(答案→)D. could have helped
解析:英语中,“情态动词 + 完成时”表示“本来……”,讲过去的情况。could have helped:本来能帮助