Quite a few (experiment) ______ tests have been done, but none of them could hel

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问题 Quite a few (experiment) ______ tests have been done, but none of them could help to cure the patient.

选项

答案 experimental

解析因为text前需用形容词来修饰，且experiment的形容词表示“实验性的”，在意思上通顺，故填experimental。句意：(医生)做了很多实验性的测试，但没有一次测试能治愈这位病人。

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