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