Scientists say we’re all born with a sense of direction,but________may not be properly understood how this works.

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问题 Scientists say we’re all born with a sense of direction,but________may not be properly understood how this works.

选项 A、this
B、that
C、it
D、they

答案C

解析 考查代词用法。本句意为“科学家们说,我们生来就具有方向感,但还不清楚它是如何起作用的”。it在此作形式主语,真正的主语是how this works。故选C。
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