2. 外语
  3. It is often difficult to decide who really deserves the credit for (invent) ______ a new device.

It is often difficult to decide who really deserves the credit for (invent) ______ a new device.

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问题 It is often difficult to decide who really deserves the credit for (invent) ______ a new device.
选项
答案inventing
解析 介词后用动名词。
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