______ we deal with our problems, we can easily become unhappy. 
#58561
A
Unless
B
Until
C
Though
D
Whether
推荐题目
It was the coldest winter, and many animals died __________ the cold.
#57329
A
thanks to
B
because of
C
instead of
D
even though
The old man is _______ please keep quiet. 
#57362
A
sleep, and
B
asleep, so
C
sleepy, but
D
sleeping, but