问题
______ over and over again, but he still couldn’t understand
A:Having explained
B:Having been explained
C:Explaining
D:It had been explained
B:Having been explained
C:Explaining
D:It had been explained
正确答案是：
同类题型
What color is it—It’s______orange.It’s ______ orange pen.
Let’s go for a walk, shall we?— It’s too late now; ________, it’s beginning to rain[ ]
Steven is busy reading ______ e-magazine now. It’s about amazing places around the world.
He was_______ at the_______ news.
ess is really fashionable andeye-catching, but it is ______ too big for me