2. 外语
  3. The thymus gland,______is located in the upper part of the chest, produces cells that help fight infection.

The thymus gland,______is located in the upper part of the chest, produces cells that help fight infection.

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问题 The thymus gland,______is located in the upper part of the chest, produces cells that help fight infection.
选项 A、it
B、who
C、that
D、which
答案D
解析 Which agrees with its referent, the thymus gland.
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