The earth became so violent that it was not clear_________ the shape would last or not.
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A
if
B
how
C
whether
D
why
推荐题目
The companies are working together to create ______ they hope will be the best means of transport in the 21st century.
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A
which
B
that
C
what
D
who
Considering that she did her work ______ her manager had instructed, it was not proper to criticize her.
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A
as
B
until
C
when
D
though
--Could you please cut the price a little? --Er... _________ you buy more than ten.
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A
even if
B
so long as
C
in case
D
as soon as
There is some doubt ____ the sick schoolboy can join in the English evening party on Sunday.
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A
/
B
whether
C
that
D
which