she is not sure()the thing介词

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sheisnotsure()thething介词sheisnotsure()thething介词sheisnotsure()thething介词about.besureaboutsth她不十分确定这件

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 .