【題目】So far scientists have done a lot of research on Mars successfully.（改為被動(dòng)語(yǔ)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(dòng)著（賓語(yǔ)）是a lot of research on Mars，改為被動(dòng)語(yǔ)態(tài)的主語(yǔ)；本句的謂語(yǔ)動(dòng)詞是“have done”現(xiàn)在完成時(shí)，改為被動(dòng)語(yǔ)態(tài)為has/have been done，被動(dòng)語(yǔ)態(tài)的主語(yǔ)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(dòng)語(yǔ)態(tài)的主語(yǔ)（by scientists）放在句子的末尾。故答案為（1）has (2) been。

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