___ the employees' working efficiency, the supervisor will allow them to have a coffee break.
#29030
A
Improving
B
To improve
C
Having improved
D
Improved
推荐题目
They did everything in their power to save the building dating back to the Qing Dynasty, but their efforts were _______.
#25186
A
in turn
B
in time
C
in vain
D
in need
Measures have been taken to fight ________recurring food safety problems, but there is still a long way to go before China can rid itself ________ these issues.
#25217
A
for; of
B
for; from
C
against; of
D
against; from
Mr. Smith sold that magnificent cottage of his on the sea _____2,000,000 dollars.
#28491
A
at
B
for
C
to
D
by
Books are the most important records we keep ________ man’s thoughts, ideas and feelings.
#28562
A
up
B
of
C
for
D
on