—Allan looks tired out.  —Sure. He      in the gym for two hours. 
#102106
A
works out
B
had worked out
C
has been working out
D
was working out
推荐题目
She couldn’t        her words        by the students even if she repeated them once again.. 
#101805
A
get…understanding
B
get…understood
C
get… to understand
D
make…understand
With the development of science, more new technology         to the field of IT.
#100766
A
has introduced
B
is being introduced
C
is introduced
D
was introduced