问题

mous professor’s lectures, though ____ informal,are considered far more informative and interesting.

A:occasionally
B:constantly
C:regularly
D:usually

正确答案是：

同类题型

The girl __________ glasses is my sister. Do you know her—No, I don’t.

It is his horse, according to the old man, ________ saved him from the trap.

What the doctors really doubt is ________ my mother will recover from the serious disease soon.[ ]

下列各句中加点的虚词，使用恰当的一句是(　　)

I_______ to the see the film Alice in Wonderland last night but for the fact that I was busy preparing for the English exam.