The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health. 
#12131
A
involved
B
being involved
C
having involved
D
to be involved
推荐题目
If I am not __________ when you phone, ask for someone else’s help.
#10907
A
accessible
B
available
C
stable
D
suitable
He is a student of ___.
#14554
A
Class First
B
the Class One
C
Class One
D
First Class
 Don’t annoy me again. I must warn you that my patience is almost_______.
#12023
A
in charge
B
in ruins
C
at present
D
at an end