But for their help, we______.A、shouldn’ t succeedB、could not have succeededC、w

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问题 But for their help, we______.

选项 A、shouldn’ t succeed
B、could not have succeeded
C、will not succeed
D、should not have succeeded

答案 B

解析本题考查虚拟语气。But for“要不是”，是对过去情况的假设，主句要用过去将来完成时。could not have done，表示“本来不能…(实际上做到了)”。所以选B。类似用法包括“should have done本应该…”。

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