It was not until then that I came to know that knowledge _______ only from practice.?
A．had comeB．has come
C．cameD．comes?
D?
主句雖然是過去時(shí)態(tài)，但從句所說明的是不受時(shí)間限制的真理或事實(shí)，名詞性從句的謂語動(dòng)詞仍然用一般現(xiàn)在時(shí)。又如:He said Asia is the largest continent.
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