灌砂试验时地表面处理平否不影响试验结果。( )
参考答案：错
解析： 地表面不平整会使灌砂体积增大，影响试验结果。
35. It was the fifth time that he ______ to such a meeting.
A．have been invited
B．was invited
C．had invited
D．had been invited
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