单选题
They ______ us since five o'clock this morning until now.
A、
are helping
B、
help
C、
have helped
D、
have been helping
【正确答案】
D
【答案解析】
since five o'clock this morning until now“自从今天早上五点钟直到现在”这一段时间一直在帮助我们。
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