So quickly are science and technology advancing ________ is a possibility today may be a reality tomorrow.
#30322
A
which
B
what
C
that which
D
that what
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Then I have learned there are a lot of troubles in our lives, but the problem is __________ they control you or you control them.
#34646
A
why
B
whether
C
that
D
what
Please call my secretary to arrange a meeting this afternoon，or________it is convenient to you.
#30232
A
whenever
B
however
C
whichever
D
wherever