Which of the following statements is NOT true? （ ）
A.In modern times，borrowing brings less than ten percent of modern English vocabulary.
B.Old English vocabulary was in essence Germanic with a small quantity of words borrowed from Latin and Scandinavian.
C.The most important mode of vocabulary development in present-day English is creation of new words by means of word-formation.
D.In early Middle English period，English，Latin，and Celtic existed side by side.
正确答案是D