问题
选择题
＿＿＿used to be thought that the earth was square.
A．He
B．What
C．It
D．That
答案
答案：C
it作形式主语，代替真正主语that从句。
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＿＿＿used to be thought that the earth was square.
A．He
B．What
C．It
D．That
答案：C
it作形式主语，代替真正主语that从句。
某产品各零部件功能重要性程度采用0-1评分法评分的结果见下表。
| 零部件 | Ⅰ | Ⅱ | Ⅲ | Ⅳ | Ⅴ |
| Ⅰ | × | ||||
| Ⅱ | 0 | × | |||
| Ⅲ | 1 | 0 | × | ||
| Ⅳ | 0 | 1 | 0 | × | |
| Ⅴ | 0 | 1 | 1 | 0 | × |
A．0.13
B．0.20
C．0.25
D．0.33