It was mainly because William （play）a game on his phone that he didn't notice the deep hole in the sidewalk until it was too late.

1. It was mainly because William （play）a game on his phone that he didn't notice the deep hole in the sidewalk until it was too late.

【考点】

过去进行时;

【答案】

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语法填空（单句）普通

语法填空（单句）普通

语法填空（单句）普通

语法填空（单句）普通