Every means tried but without any result.A. have beenB. is to beC. are to beD. has been

发布时间：2020-08-17 14:48:13

Every means      tried but without any result.
A. have been
B. is to be
C. are to be
D. has been

网友回答

A. have been
B. is to be
C. are to be
(答案→)D. has been
解析：此题考查时态和语态。句意：每种方法都试了，但是没有结果。由句意可知要用现在完成时态，强调对现在造成的影响。
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