[題目] 寂天閱讀滿分2_Test10 p.253 Q117
書名：寂天挑戰新多益閱讀滿分2
版本：2016/01 初版
頁數：p.253 第117題
題目：
This thermal cooling system is ___ keeps the engine's temperature
safely regulated.
(A) who
(B) which
(C) why
(D) what
疑問：為甚麼是D而不是B
我的想法是：which keeps=keeping，重組句子意思看起來也很順... XD
但是他提供的答案是what，還請版眾幫忙解惑。謝謝!
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