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【单选题】
The task was difficult, but their _____ expression let us know that they would not give up easily.
[ ]
A.
reliable
B.
determined
C.
concerned
D.
grateful
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参考解析：
刷刷题刷刷变学霸
举一反三
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A.
put off
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put down
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put up
D.
put away
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A.
achieved
B.
has achieved
C.
will achieve
D.
had achieved
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A.
enthusiastic
B.
concerned
C.
doubtful
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cautious
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A.
concentrate on; drive
B.
concentrate in; driving
C.
concentrate to; drove
D.
concentrate on; driving
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A.
will go
B.
will have gone
C.
goes
D.
has been going
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A.
not to
B.
not to do
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not do it
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do not do
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A.
still
B.
steady
C.
stable
D.
secret
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A.
of helping
B.
to help
C.
to helping
D.
of to help
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A.
that
B.
when
C.
where
D.
why
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A.
caught
B.
missed
C.
stuck
D.
buried