2. 外语
  3. The number of students who failed______50 percent.

The number of students who failed______50 percent.

admin2013-06-19  28
问题 The number of students who failed______50 percent.
选项 A、have increased to
B、has increased to
C、increasing to
D、had increased to
答案B
解析 主谓一致。The number of+N(pl)作主语时，谓语动词用单数形式。
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