It was decades ago ________ I was in my teens ________ the Chinese government decided to reform the social economic system.
#4831
A
when; when
B
that; which
C
when; that
D
before; that
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The river, ______the bank are covered with trees, is very long.
#4972
A
whose
B
which
C
of which
D
which of
.We will learn how to operate the machine _______.
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A
at a time
B
at one time
C
at the time
D
in time
.The plane ______, _______ all 200 people aboard.
#4771
A
survived; to kill
B
crashed; killing
C
missed; killed
D
balanced; and killing