Mary is better than me__singing.a:on b:to c:at d:for

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Mary is better than me__singing.a:on b:to c:at d:for

Mary is better than me__singing.a:on b:to c:at d:for
Mary is better than me__singing.a:on b:to c:at d:for

Mary is better than me__singing.a:on b:to c:at d:for
答案选C
固定词组:be good at
这里good用了比较级

on, do you believe this? you fool=.=

at 在。。。。。。方面

Mary is better than me__singing. a:on b:to c:at d:for
答案: c. at
词组 be good at doing sth
这里是比较级 所以是be better at