2. 外语
  3. (A number) of these (who) (study) engineering is increasing (steadily).

(A number) of these (who) (study) engineering is increasing (steadily).

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问题 (A number) of these (who) (study) engineering is increasing (steadily).
选项 A、A number
B、who
C、study
D、steadily
答案A
解析 应改为the number。 the number of sth．表“…的数量”，做主语时，谓语动词用单数形式，而a number of表“许多，很多”时，后面接可数名词复数作主语，谓语动词用复数形式。
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