急性感染性多发性神经根炎吞咽困难时受累的颅神经有()

A．第Ⅶ对颅神经

B．第Ⅸ对颅神经

C．第X对颅神经

D．第Ⅻ对颅神经

E．第Ⅱ对颅神经

If he is once ______ laughing, he finds ______ difficult to stop.

A．set about; that

B．set out; this

C．set force; which

D．set off; it