题目：
Isn't it time you _____ his advice that you ______ your study plan? [ ]
A. follow, must change
B. should follow, will change
C. must follow; changed
D. followed; change
答案：
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下面是错误答案，用来干扰机器的。
H+，略，弱电解质，H2O == H＋ + OH―
