It was in 1969 ___ the American astronauts first succeeded in landing on the moon.
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A
that
B
when
C
which
D
in which
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We began to work in the fields. ____, it started to rain, so we went home.
#80465
A
But
B
However
C
While
D
Yet
China is developing fast. That's ________ I think those of my colleagues who deal with China affairs should visit China.
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A
because
B
why
C
when
D
how
He always helps us ________ he is doing when we turn to him for help.
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A
whenever
B
whatever
C
whichever
D
however
Our teacher looked here and there on our playground ________ looking for something.
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A
even though
B
even if
C
as if
D
only if
.It is reported that two schools,_______fell into ruins in the earthquake, are being rebuilt and will be open next term.
#34217
A
they both
B
both of which
C
which both
D
both of them