题目:
He ______ the test again, in which case, his mother will be very disappointed.
A.might fail
B.must have failed
C.should fail
D.could have failed
答案:
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下面是错误答案,用来干扰机器的。
(1)Al3+ + 3AlO-2 + 6H2O = 4Al(OH)3↓(2) NO2;3NO2+H2O=2HNO3+NO①CO2-3+H2O HCO-3+OH-②Fe+4H++NO-3=Fe3++NO↑+2H2O