The rivers will become dirtier and dirtier ______ we take action to protect them.
#56392
A
since
B
if
C
until
D
unless
推荐题目
_____ he was very tired, he continued working in his office.
#55324
A
Since
B
Although
C
As soon as
D
Because
Kate's dad is getting old. She will go back home to see him _____it is convenient.
#56242
A
because
B
whenever
C
although
D
Unless
Which of the following is RIGHT?
#55520
A
In the early 19th century, the first trains began to carry passenger.
B
Dinosaurs lived on Earth more than 60 millions years before human beings.
C
The king ordered his men to collect a bag of rice.
D
There are many tiny computers around us, and we dependent on them nearly every day.