对下列句子的句式判断错误的一项是（3分）

Usually, a mother wolf gives birth to five to seven baby wolves .

Let’s ask Michael. I think he can_______a good idea about how to deal with this problem.

Now I come here at the ______ of Mr.Smith to assist him finishing the work.

— Have you heard that the pop star wascharged with taking illegal drugs — It’s difficult for a funlike me to accept that _________