问题
选择题
“The moment ______ soon,” he thought to himself, waiting nervously.[ ]
A. came
B. has tome
C. was coming
D. is coming
答案
答案：D
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“The moment ______ soon,” he thought to himself, waiting nervously.[ ]
A. came
B. has tome
C. was coming
D. is coming
答案：D
2HBr(g)达到平衡的标志是