a) Did he go over his lessons,then？
b) Did he go over his lessons then？
a) There were,too,many children there.
b) There were too many children there.
a) I didn't go to see her because she was ill.
b) I didn't go to see her,because she was ill.
以上這些這幾句，分別是什麼意思？
謝謝!!!
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