把doing sth.and doing sth.作为主语,谓语动词用单数?复数?比如说,Reading books and doing homework ___ good for us.那么横线上填什么谓语动词?用is,还是are?但不是有两个动名词吗?

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把doing sth.and doing sth.作为主语,谓语动词用单数?复数?比如说,Reading books and doing homework ___ good for us.那么横线上填什么谓语动词?用is,还是are?但不是有两个动名词吗?
把doing sth.and doing sth.作为主语,谓语动词用单数?复数?
比如说,Reading books and doing homework ___ good for us.
那么横线上填什么谓语动词?用is,还是are?
但不是有两个动名词吗?

把doing sth.and doing sth.作为主语,谓语动词用单数?复数?比如说,Reading books and doing homework ___ good for us.那么横线上填什么谓语动词?用is,还是are?但不是有两个动名词吗?
用is.
只有在可数名词的复数后的谓语动词才用复数,虽然Reading books and doing homework 相当于两个名词,但是都是不可数的.