一到英语选择题说原因 ················
问题描述：
一到英语选择题说原因 ················
—Tom,everybody was in the hall except you.
—Sorry,but I_____my parents water the flowers in our garden.
A.am helping B.was helping C.had helped D.helped
答
B
“对不起,我当时正在帮父母浇花”,这里强调的是过去正在进行,也就是大家在大厅的同时.是过去发生的,又是当时正进行的