Theories have features that are (indicative) of their truth, and the task of justification is to identify these features and (us

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问题 Theories have features that are (indicative) of their truth, and the task of justification is to identify these features and (using them) to guide choices (as to) (which theories) to believe.

选项 A、indicative
B、using them
C、as to
D、which theories

答案B

解析 (改为:use them)to后面接动词原形。
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