隧道内开挖应严格控制欠挖。当岩层完整、岩石抗压强度大于30MPa并确认不影响衬砌结构稳定和强度时，也不允许欠挖。
参考答案：错
I thought Jim would say something about his school report, but he ______ it.
A．doesn’t mention
B．hadn’t mentioned
C．didn’t mention
D．hasn’t mentioned
分泌性中耳炎临床表现是什么？
