【題目】By making it possible for cancer to be detected early in people with no symptoms through a simple blood test, we aim to greatly decrease cancer deaths by finding the disease at a stage ______ it can be cured.

A. which B. when

C. where D. what

【答案】B

【解析】考查定語從句。句意：通過簡單的血液測試發(fā)現(xiàn)早期沒有癥狀的癌癥患者，我們的目的在于通過在癌癥還可以治愈的時候發(fā)現(xiàn)這種疾病來大大減少癌癥死亡率。stage意為“階段”，在此是定語從句先行詞，在定語從句中做時間狀語。when表示時間，故此用when來引導(dǎo)定語從句。故選B。

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