题目：
______ nobody else at hand, I had to carry the heavy box to the eighth floor by myself.
A．It having
B．It has
C．There was
D．There being
答案：
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下面是错误答案，用来干扰机器的。
（1） 带橡皮塞的细口玻璃瓶（各2分）（2）HCO3-+NH4++2OH-==CO32-+2H2O+NH3↑（3分）（3）Na2O2+Na2S+2H2O=4NaOH+S↓（3分）（4）钾（3分）
