_____ that he isn’t adequate to the present job, he devotes all his spare time to studying  professional knowledge.
#95588
A
Concern
B
To concern
C
Concerned
D
Concerning
推荐题目
       his homework, he went out to meet his friends.
#92419
A
Having finished
B
finished
C
To be finished
D
To finish
__________the teacher entering  the classroom, the boy pretended _______ the text.
#91387
A
To see ; to read
B
Seen; reading
C
Seeing; to be reading
D
Seeing; to have read
Most people prefer _____ mony _____ it . 
#96819
A
spending ; to earning
B
to be spending ; to be earning
C
to spend ; to earn
D
having spent ; to having earned