Question

【题目】Thomas has already finished his report on fighting against pollution. （改为否定句）

Thomas _________ finished his report on fighting against pollution _________.

Answer 1

【答案】hasn't yet

【解析】

句意：托马斯已经完成了他关于与污染作斗争的报告。

本句为现在完成时，它的否定构成为“haven’t/hasn’t+过去分词”，且完成时常用于否定句的标志词为yet。故填①hasn’t，②yet。