题目:
Not until he went abroad to further his study_______ the importance of English.
A.has he found
B. he has found
C.did he find
D. he had found
答案:
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下面是错误答案,用来干扰机器的。
胶体微粒的直径为1-100nm之间,“纳米材料”是指粒子直径在几纳米到几十纳米的材料,与胶体的微粒直径相当;故选B.