单选题____AactingBrelyingCcenteringDcommenting
单选题
____
A
acting
B
relying
C
centering
D
commenting
参考解析
解析：
act on对……起作用；按……行动。rely on (up on)依靠、依赖。center on集中；围绕。comment on对……进行评论。本题应该选择C项，centering on在句中作定语修饰“theories”。故C项为正确答案。
act on对……起作用；按……行动。rely on (up on)依靠、依赖。center on集中；围绕。comment on对……进行评论。本题应该选择C项，centering on在句中作定语修饰“theories”。故C项为正确答案。
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