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As he（） up since 4 a.m.，he is，no doubt，very tired now.
As he（） up since 4 a.m.，he is，no doubt，very tired now.
A、is
B、was
C、has been
D、had been
正确答案：C
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If had studied hard，I（） the examination.
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A little girl tramping around in the Pennsylvania woods near her home feels close to the birds and plants and animals. She is at ease ivith them.