---We’ve seen many more days of blue skies recently. ---True. But back in 1998, ________ Beijing started its “Defending the Blue Sky” program, the city only ________ about 100 days a year.
#34101
A
which, sees
B
that, saw
C
when, saw
D
and, seeing
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To improne the pmlity of our products we uaked for nuggratior a had used the producu.
#34749
A
whacver
B
who
C
whichever
D
which
He’ll never forget the years _______ he studied in Oxford University.
#33993
A
where
B
on which
C
when
D
which