It is vital that he___to the new environment as soon as possible.A.adapt B.adapts C.must adapt D.adopts本人：A 需解析 英语
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【答案】 it is vital that...后面加虚拟语气 表什么什么是至关重要的 必须的
原来应该是 it is vital that he should adapt to...
这里should可以省略的
类似加虚拟语气的的还有 it is important that ...
it is essential that...