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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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He went out to Long Beach to thank Mr. Brown， who had provided assistance while he was studying at college. Arrangements（） beforehand， of course.
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We"ll have to go without him unless he（） before our train departs.