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It was not until then that I came to know that knowledge _______ only from practice.?
A.had comeB.has come
C.cameD.comes?
D?
主句虽然是过去时态,但从句所说明的是不受时间限制的真理或事实,名词性从句的谓语动词仍然用一般现在时。又如:He said Asia is the largest continent.
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