The government of the United States began at once to investigate the case ______ a lot of students were killed.
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A
that
B
when
C
where
D
why
推荐题目
After ten hours’ drive, we came to ______ is called a green house, through the glass wall of _____, we saw lots of green plants.
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A
where, which
B
that, that
C
what, which
D
where, that
People take naps at noon in warmer climates, ____ the heat makes work difficult in the early afternoon.
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A
which
B
what
C
where
D
when
After being brought up in the countryside for a decade, the daughter returned to the big city, ________ worked his parents.
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A
which
B
/
C
where
D
when
The most important thing_______we should pay attention to is the thing_______I have said.
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A
which that
B
that which
C
which which
D
that that