A-A+
They ______ us since five o'clock this morning
问题详情
They ______ us since five o"clock this morning until now.
A．are helping
B．help
C．have helped
D．have been helping请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：D
解析：sincefiveo'clockthismorninguntilnow“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。
