毛管内径与顶头直径之差叫做()。
参考答案:扩展值
About 187 passengers were reported _____ the shipwreck which happened last month.
A.to have been survived
B.having survived
C.to have survived
D.to survive
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性:()
A.A
B.B
C.C
D.D