It’s the gases ___ natural gas and the burning of coal give off ____ add to the overheating of the earth.
#85172
A
that; what
B
that; that
C
which; which
D
that; which
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---He ought to have been warned of the danger. ---_______, but he wouldn’t listen to me.
#85281
A
He did
B
He should
C
He ought to
D
He was
It was President Xi Jinping ________ visited the navy troops and urged to strengthen naval force on April 9,2013.
#84717
A
when
B
which
C
that
D
he
Do you know since when it is ________ you have been interested in poetry?
#85312
A
when
B
until
C
how
D
that