The boy dived into the water and after ___ seemed to be a long time, he came up again.
#73556
A
what
B
that
C
it
D
which
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that they may eventually reduce the amount of labor needed on construction sites by 90 percent．
#69828
A
Such construction robots are clever
B
So clever the construction robots are
C
Such clever construction robots are
D
So clever are the construction robots
Is this research center ________ you visited the modern equipment last year?
#73307
A
where
B
that
C
the one that
D
the one where
It was in the factory producced TV sets our friend was murdered.
#70088
A
which ; which
B
that ; which
C
that ; that
D
where ;that
This problem may lead to more serious ones if ______ unsolved.
#67907
A
making
B
remained
C
keeping
D
left
There was________much smoke________they couldn’t see across the hallway.
#66861
A
too；that
B
such；as
C
so；that
D
rather；than