题目内容
Every means ______ tried but without any result.
| A.have been | B.is to be | C.are to be | D.has been |
D
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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| A.have been | B.is to be | C.are to be | D.has been |