问题描述：
We left the mother a note ____she was worried when she came back..选项:a、if b、so that c、in cas
We left the mother a note ____she was worried when she came back..
选项:
a、if
b、so that
c、in case
d、unless
We left the mother a note ____she was worried when she came back..
选项:
a、if
b、so that
c、in case
d、unless
问题解答：
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