同义句转换:He was ill yesterday.This is why he didn't come.→He didn't come yesterday.(接上)______ ______ ______ he was ill.

问题描述:

同义句转换:He was ill yesterday.This is why he didn't come.→He didn't come yesterday.
(接上)______ ______ ______ he was ill.

because (一个空的用词)
因为
on account of (三个空的用词)
因为