【題目】So far scientists have done a lot of research on Mars successfully.（改為被動語態(tài)）

So far a lot of research on Mars ________ ________ done successfully by scientists.

【答案】has been

【解析】

本句的受動著（賓語）是a lot of research on Mars，改為被動語態(tài)的主語；本句的謂語動詞是“have done”現(xiàn)在完成時，改為被動語態(tài)為has/have been done，被動語態(tài)的主語a lot of research on Mars是第三人稱單數(shù)，可知使用has；其他部分照抄，by+主動語態(tài)的主語（by scientists）放在句子的末尾。故答案為（1）has (2) been。

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