What a good boy!

问题描述:

What a good boy!

So he is.He ________ hard at his studies all the time.
A.works
B.is working
C.had been working
D.will be working

B
一般现在时,’ 他一直努力学习‘一般现在时不应该选A么打错了,是A答案给的B都弄糊涂了, all the time 一直( 在做某事),现在进行时更好。