13．There is “f and “u in the word “four . A．an; a B．a; a C．an; an D．a; an——青夏教育精英家教网—

摘要：13．There is “f and “u in the word “four . A．an; a B．a; a C．an; an D．a; an

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There is ______ "f" and ______"u" in the word "four".