错畸形发生的早期通常采取何种矫治方法()。
A.预防性矫治
B.阻断性矫治
C.一般矫治
D.外科矫治
E.以上都不是
参考答案:B
-----I bought this dictionary two weeks ago.
----You mean you __________ it for half a month.
A.have kept
B.have had
C.have bought
D.have taken
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