问题

“ Although ,” the boy said , “ _______ overand over , the maths problem remained confusing to me ” .

A:which
B:explain
C:explaining
D:having explained

正确答案是：

同类题型

He asked his father ________

一 Whatwould you do if it ______ tomorrow一 Wehave to carry it on, since we’ve got everything ready.

We all know that Jackie Chan is good at ________ Chinese kung fu.

John, you _______ stay out too late. Your mother will worry about you.

Sir, you ________ take this seat. It’s just for the old.