D
固定短语:keep doing sth
句意是:他很忙.这些日子他一直在工作.
He is busy.He keeps ____ these days. A work B to work C works D working 要理由.
He is busy.He keeps ____ these days. A work B to work C works D working 要理由.
英语人气:508 ℃时间:2019-08-22 20:30:54
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