the teacher spent plenty of time () the problem ()the boy,bu
the teacher spent plenty of time () the problem ()the boy,but he still didn't know how to work
it out
A on explaining,for
Bexplaining,for
Cin explaining ,to
Dto explain,to
it out
A on explaining,for
Bexplaining,for
Cin explaining ,to
Dto explain,to
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1年前1个回答
你能帮帮他们吗