---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
推荐题目
Some of my workmates prefer to send to our QQ group ______ news they got.
#30165
A
whatever
B
however
C
whichever
D
whenever
Adam behaved _________ he had never heard such a thing before.
#30863
A
in case
B
as if
C
while
D
though
— How long is it ______ you picked up your badminton training?— It was not until my finance became better in last December ______ I started the training.
#33299
A
before; when
B
until; that
C
that; when
D
since; that