The thieves ran away when the burglar alarm(防盗警报器)       .
#66446
A
broke away
B
came back
C
went badly
D
went off
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The number of  the students in our school ________ about 3000 and ______ them study hard.
#67936
A
is, a large amount of
B
are, a number of
C
are, large amount of
D
is, a large number of