________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
Blamed for breaking my promise, I felt my face ______ hot, and hung my head in shame.
#96235
A
to grow
B
to be growing
C
grow
D
grown
Microblogs experienced rapid growth in 2013 in China, with its operators, users and visitors several times.
#89263
A
increase
B
increased
C
increasing
D
to increase
Every minute is made full use of _______ our lessons.
#97952
A
studying
B
to study
C
study
D
being studied
—Would you like to go to the shopping mall with me tonight? —I’d like to, but I have to attend a lecture _______ in the school library.
#90125
A
given
B
being given
C
having been given
D
to be given
The retired worker likes getting up early. The air in the morning is good ______.
#88421
A
being breathed
B
breathing
C
to be breathed
D
to breathe