自考《英语（二）》试题练习：虚拟语气（6.6）
单选题
[2007.04]If the operation ________ carefully prepared， it would not have been successful.
A.was not
B.has not been
C.had not been
D.were not
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单选题
[2007.04]If the operation ________ carefully prepared， it would not have been successful.
A.was not
B.has not been
C.had not been
D.were not
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