While playing ping-pong, our eyes see the ball coming, judge its speed and then hit it back ________ it should go.
#72176
A
when
B
why
C
what
D
where
推荐题目
There is some doubt _________ Mr Zhang will sign the contract with us.
#69318
A
when
B
whether
C
if
D
that
He found it increasingly difficult to read, ______ his eyesight was beginning to fail.
#74431
A
though
B
for
C
but
D
so
According to the United Nations, an aging society refers to one ____ 10 percent or more of the population is over 60, or 7 percent or more is over 65.
#68932
A
where
B
when
C
which
D
that
We haven’t settled the problem of_______it is necessary for him to study abroad.
#73977
A
that
B
whether
C
what
D
if
That art centre is______used to be a factory,________millions of cars were made in.
#74111
A
what; which
B
where；where
C
what; where
D
where; which