They ______ us since five o’clock this morning until now.A、are helpingB、helpC、

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问题 They ______ us since five o’clock this morning until now.

选项 A、are helping
B、help
C、have helped
D、have been helping

答案 D

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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