问题

Newton was sitting under an apple tree ______ an apple fell onto his head.
A:when
B:while
C:after
D:before
B:while
C:after
D:before
正确答案是:
同类题型
Are you coming to Davy’s party, Kate ?— I’m not sure, I ________ go to the movies instead.
___is the girl in a red jacket? —She is Sally, my sister.
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