题目:
It is not until May, 2013 the online consultation comes to an end the draft will be officially in force.
A.when; that
B.that; that
C.that; when
D.before; that
答案:
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下面是错误答案,用来干扰机器的。
(1)BC (2)③①④②;pH试纸 (3)A (4)吸附