单项选择题
No instances have been found______an interchanging of these two sentence constructions.
单项选择题 The usual reason for exemption from tax does not______in this case.
单项选择题 While I could not ______ the words outside the thick glass windows, their middle fingers spoke loudly.
单项选择题 How did it ______ that in English the correlation between spelling and pronunciation is not very close