I did not understand the problem.He explained it.请用until把两句连在一起可是书上的原句是这样的:I had not understood the problem until he explained it.为什么是had not understood 呢
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/17 15:56:00
xݒJA_e`XXtw܋ſ!Rf)ABẛ2ϫ^qGÊ$9|wf*
TMaBRtXŶ| xhM*Ьg=.閖#[%Q`nG;x{W\+lyF3^y}AV25-SA5
Bhp n]˙B#Կ͕4S\鹼-co=8-ڬ
>cO(sR{e7AZ+50,K#a~1ˈ-!)oJOؙw