The boy said ___ couldn't he work out the problem but his teacher didn't know how to do it.
#84252
A
though 
B
never 
C
hardly
D
not only
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We laugh at jokes,but seldom____________about how they work.
#83338
A
we think
B
think we
C
we do think
D
do we think
(2013·高考新课标全国卷Ⅱ)Only by increasing the number of doctors by 50 percent  ________ properly in this hospital.
#80043
A
can be the patients treated
B
can the patients be treated
C
the patients can be treated
D
treated can be the patients
Only when        .
#83787
A
did he arrive the meeting began
B
he arrived did the meeting begin
C
did he arrive the meeting begin
D
he arrived the meeting began