b 因为是从今天早上五点到现在还在帮助我们
而且 有since 提示
所以用现在完成进行时
They_____us since five o'clock this morning.
They_____us since five o'clock this morning.
(A)are helping(B)have beng helping(C)have beng helped
(D)have helped
(A)are helping(B)have beng helping(C)have beng helped
(D)have helped
英语人气：381 ℃时间：2020-03-29 16:46:40
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