________the working efficiency, the boss allows the employees to have a coffee break. 
#96343
A
Improving
B
To improve
C
Having improved
D
Improved
推荐题目
________ with the size of the whole earth, the biggest ocean does not seem big at all.
#94271
A
Compare
B
When comparing
C
Comparing
D
When compared
I still remember     to the Famen Temple and what I saw there. 
#98963
A
to take
B
to be taken
C
taking
D
being taken
 The boy ______ in the exam is a student in Class Nine.
#90232
A
catching cheating
B
caught cheated
C
catching cheated
D
caught cheating