问题详情:
Newton was playing under an apple tree____ an apple fell onto his head.
A. while B. when C. before
【回答】
B
知识点:连词
题型:选择题
问题详情:
Newton was playing under an apple tree____ an apple fell onto his head.
A. while B. when C. before
【回答】
B
知识点:连词
题型:选择题