(2013·高考浙江卷)There are some health problems that,when ________ in time,can become bigger ones later on.
#80025
A
not treated
B
not being treated
C
not to be treated
D
not having been treated
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He left home in 1980 and has never come back ____. 
#84129
A
though
B
while
C
when
D
since
Tom doesn’t want to take part in any school activities,________.
#84199
A
and David doesn’t too
B
and David doesn’t either
C
and so doesn’t David
D
and either does David