----____________when has he started boxing?----2006, I suppose.
#79753
A
In
B
Since
C
Before
D
After
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She had just finished her homework _____her mother asked her to practice playing the piano yesterday.
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A
when
B
while
C
after
D
since
It remains to be seen _______the newly formed committee’s policy can be put into practice.
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A
that
B
which
C
what
D
whether
The policy of the mainland is very clear and straightforward，and the key problem is_____the leaders of Taiwan will accept it.
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A
that
B
how
C
why
D
whether
We must take measures to protect endangered wildlife _______ it is too late.
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A
now that
B
as long as
C
unless
D
before