The basic causes are unknown though certain conditions that may lead to cancer have been______.

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问题 The basic causes are unknown though certain conditions that may lead to cancer have been______.

选项 A、identified
B、guaranteed
C、notified
D、conveyed

答案A

解析本题考查动词。identify“确定，鉴别”，guarantee“保证”，notify“通知”，convey“传达”，很明显本题答案为A。

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考博英语

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The basic causes are unknown though certain conditions that may lead to cancer have been______.

考博英语

Please____fromsmokinguntiltheaeroplaneisairborne.

Duringthenormaldevelopmentofself,achildisaffectedbycertaininfluentialfactors.【R1】_____.Infantsformanattachment

Writeanessayinnolessthan250wordswiththetitle"MyUnderstandingofGlobalization".Youressayshouldbewrittenonthe

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