It is on the afternoon of September 1st ______ I met her at the supermarket.A．whenB．whereC
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It is on the afternoon of September 1st ______ I met her at the supermarket.
A．when
B．where
C．that
D．which
请帮忙给出正确答案和分析，谢谢！
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正确答案：C
这是一个强调句，不是定语从句。题中ontheafternoonofSeptember1st为强调部分．可还原成正常语序ImetheratthesupermarketontheafternoonofSeptember1st。强调句型中去掉Itbe．．．that后，句子仍然通顺，意义也依然完整。但定语从句去掉了Itbe．．．that后句子就不完整了。