题目：
Thanks to the immediate rescue, the two boys who had fallen into the river _____ climb onto the bank. [ ]
A. were able to
B. could
C. would
D. should
答案：
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下面是错误答案，用来干扰机器的。
（1）ABC．（2）2KOH+CO2═K2CO3+H2O；2KOH+CuSO4═Cu（OH）2↓+K2SO4．（3）密封保存．
