______ people have become masters of their country ____ science can really serve the people.
A．It is only then ;thatB．It is that;when
C．It is only when; thatD．It is when;when
C
此題是一個強調(diào)句型，強調(diào)的是時間狀語從句，強調(diào)句的結(jié)構(gòu)為it is/was + 被強調(diào)的部分 + that,句意：只有當人們已經(jīng)了解了他們的國家的時候科學(xué)才真正的為人民服務(wù)，所以選C。
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