---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
The engineers are so busy that they have no time for outdoor sports activities, ________ they have the interest.
#32452
A
wherever
B
whenever
C
even if
D
as if
_____difficulty we will face, we should have confidence and try to solve it.
#32315
A
However
B
No matter how
C
Whatever
D
Whenever
How can they expect to learn anything ________ they never listen?
#30286
A
whether
B
when
C
but
D
unless