A cure for cancer is bound one of these days.
A.to discover
B.to discovering
C.to being discovered
D.to be discovered

A.A.to
B.to
C.to
D.to

【参考答案】

D
解析：句意：近日癌症的治愈方法是必然会发现的。考查动词不定式的被动式。根据上下文to be discove......

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