They are putting too much carbon dioxide into the atmosphere, ______ prevents heat from escaping from the earth into space.
#31962
A
what
B
that
C
which
D
who
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_____but he still couldn’t understand the logical connection of the two subjects.
#30645
A
Having told many times
B
Having been told many times
C
He was told many times
D
Many times as he was told
I was excited ＿＿ I came to this school.
#31705
A
for the first time
B
the first time
C
at first
D
the first time when
Remember that you won't be able to cancel the contract ____you've signed.
#80351
A
before
B
until
C
once
D
though
A stubborn boy like him dosen’t learn from his mistakes______ he was punished badly.
#32849
A
if
B
when
C
since
D
unless