胃液酸度增高最明显的疾患是
A．胃溃疡B．十二指肠溃疡C．萎缩性胃炎D．胃癌E．恶性贫血
参考答案：B
They could have attended the awarding ceremony，but their flight due to the bad weather．
A．was delayed
B．had been delayed
C．has delayed
D．was delaying
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