he always spending his time and energy on something that was going to prove ----a dead endA.to be B to have been更纠结了 讲下理由呗

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healwaysspendinghistimeandenergyonsomethingthatwasgoingtoprove----adeadendA.tobeBtohavebeen更纠结了讲下理由呗

he always spending his time and energy on something that was going to prove ----a dead endA.to be B to have been更纠结了 讲下理由呗
he always spending his time and energy on something that was going to prove ----a dead end
A.to be B to have been
更纠结了 讲下理由呗

he always spending his time and energy on something that was going to prove ----a dead endA.to be B to have been更纠结了 讲下理由呗
B 如果前面是is going to prove 就选A 但前面是was 是过去式 后面就用 to have been.

A

应该是A吧