As he（） up since 4 a.m， he is， no doubt， very tired now.

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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

Tag：时间：2025-12-03 23:28:45

上一篇：He went out to Long Beach to thank Mr. Brown， who had provided assistance while he was studying at college. Arrangements（） beforehand， of course.
下一篇：We"ll have to go without him unless he（） before our train departs.

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