America will never again have as a nation the spirit of adventure as it ______ before the West was settled.
A．hasB．didC．wasD．would
B
此題考查同一動詞重復(fù)使用時用助動詞替代的用法。本句主句中的動詞是have， as從句完整寫出應(yīng)是：“as it had the spirit of adventure．．．”，其中had應(yīng)用與其時態(tài)一致的助動詞did來代替。[A]項的時態(tài)不對，因為它是相對于一個過去的時間來說的；[C]項是系動詞的單數(shù)過去時態(tài)，不能代替實義動詞；D.項為一般過去將來時，時態(tài)不對。
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