2. 外语
  3. Beginning around 1830, the Underground Railroad helped thousands of escaped slaves ______their way north to freedom.

Beginning around 1830, the Underground Railroad helped thousands of escaped slaves ______their way north to freedom.

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问题 Beginning around 1830, the Underground Railroad helped thousands of escaped slaves ______their way north to freedom.
选项 A、to find
B、were finding
C、found
D、to be found
答案A
解析 The causative helped is followed by an infinitive: to find.
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