It was at 10 o’clock last night ________ the visitors finally arrived at Zunyi Airport.
#84809
A
when
B
that
C
before
D
after
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It is in their ability to speak ________ humans ________ from animals.
#85151
A
which;differ
B
that;different
C
which;different
D
that;differ
The question that puzzles them is ___they can finish the work on time. 
#84854
A
what it is that
B
what is it that
C
how is it that
D
how it is that
It was not until the end of the meeting_____________.
#85496
A
that she turned up
B
when she turned up
C
did she turn up
D
had she turned up