Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.
#4678
A
producing
B
having been produced
C
to be produced
D
produced
推荐题目
_____________ is a fact that English is accepted as an international language.
#59083
A
There
B
This
C
That
D
It
Though we found _____difficult to avoid economic and financial crisis, we must take measures to reduce its negative impact.
#4854
A
it
B
one
C
that
D
how
She doesn't know _________________ made her daughter so sad this morning.
#4816
A
what was it
B
why it was that
C
how that was
D
what it was that
These photographs will show you _____________.
#4992
A
what does our village look like
B
what our village looks like
C
how does our village look like
D
how our village looks like