Question

【题目】用方框中所给词的适当形式填空。

clean，build，plant，hand

【1】By the end of last year, another bridge _________ here.

【2】Your paper must _________ in as soon as the bell rings.

【3】We are glad to find that many trees ________ last years.

【4】Your bedroom should ________ every day.

Answer 1

【答案】

【1】had been built

【2】be handed

【3】were planted

【4】be cleaned

【解析】

【1】根据By the end of last year“截止到去年年底”，判断句子时态为过去完成时，且bridge与build之间为被动关系，所以为had been built。

【2】hand in sth意为“交上……”，其被动式为sth be handed in，所以paper与hand in之间为被动关系，且在情态动词must之后，所以使用系动词原形be。

【3】由trees判断使用动词plant，且两者为被动关系，且根据last years判断使用过去时；由句子主语many trees确定系动词为were。

【4】由bedroom确定动词为clean，且为被动式；在情态动词should之后应使用系动词原形be。