Mr. Smith is busy these days ________ a new book on how to develop a child’s reading skill.
#96734
A
working out
B
working on
C
working for
D
working with
推荐题目
I can make you _____ what I say, but you can’t make yourself ___________ in English.
#95661
A
understand; understand
B
understand; understood
C
to understand; understand
D
understand; to be understood
_______to sunlight for too much time will do harm to one’s skin. 
#94144
A
Exposing
B
Being exposed
C
Having exposed
D
Exposed
He is said ______ several books since 1996.
#97427
A
that he’s written
B
to have written
C
to be writing
D
to write