________is no doubt that today greenhouse gases are the largest human influence on global climate.
#91866
A
It
B
There
C
This
D
That
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It is a long time _______they separated, but it won’t be long ____ they meet again.
#94026
A
since; before
B
after; when
C
since; when
D
after; before
 Would you explain _____?
#94892
A
the meaning to us
B
us the meaning
C
us to the meaning
D
the meaning us