问题
选择题
His teacher kept telling him that he should recite the text, but _______ didn't help. [ ]
A. it
B. she
C. he
D. which
答案
答案：A
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His teacher kept telling him that he should recite the text, but _______ didn't help. [ ]
A. it
B. she
C. he
D. which
答案：A
，用“
，则保持水的化学性质的粒子可表示为 [ ]
