The infrastructure of a country is makes everything run smoothly， including things like transport， irrigation， electricity， postal service， telephones and schools.
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A
that
B
what
C
which
D
as
推荐题目
She may have been caught in the heavy traffic, ____ she won’t arrive here by five o’clock.
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A
in case
B
in case of
C
in that case
D
in which case
--Did Mary return late last night?--No. It was not yet 7 o’clock _________ she arrived home.
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A
before
B
when
C
that
D
until
His mother kept telling him to____ his manners at the party.So he became impatient.
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A
mind
B
notice
C
watch
D
care
TV-Turnoff Week, _______ millions of people around the world participate every year, tries to encourage people to turn on life.
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A
in which
B
on which
C
which
D
when