Only by ______ your attention ______ what you are learning can you learn it well.
A．focus；on
B．pay；on
C．focusing；on
D．paying；on
C
by是介詞，后面用動名詞形式。句意：只有把精力集中在你所學(xué)的東西上，你才能學(xué)好它。focus...on...“把……集中在……上”，固定短語。
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