she is not sure()the thing介词
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she is not sure()the thing介词
she is not sure()the thing介词
she is not sure()the thing介词
about.
be sure about sth
她不十分确定这件事 .
she is not sure()the thing介词
she is not sure()the thing介词
she is not sure()the thing介词
about.
be sure about sth
她不十分确定这件事 .