____ this may sound like a simple process, great care is needed．
#33084
A
Since
B
Once
C
Although
D
Unless
推荐题目
________ a child begins school, he enters a world of vicious competition where success and failure are clearly defined and measured.
#33375
A
Before
B
Until
C
Whenever
D
The moment
He had to be reminded two or three times ________ he could avoid making the same mistake.
#33440
A
before
B
until
C
when
D
after
One Friday, we were packing to leave for a weekend away _____ my daughter heard cries for help.
#31425
A
after
B
while
C
since
D
when
Neighbors said they heard the man tell the woman that she couldn’t leave______ she gave back the money borrowed from him.
#30911
A
unless
B
since
C
if
D
though