____ the paper,i have to write it carefullya:starting b:after startingc:having started d:once i start
问题描述：
____ the paper,i have to write it carefully
a:starting
b:after starting
c:having started
d:once i start
答
d: "once i start "
once i start the paper, i have to write it carefully
一旦我开始写论文，我就必须很仔细的完成。
答
once i start
答
d
答
____ the paper, i have to write it carefully
a: starting
答
d: once i start the paper, i have to write it carefully
一旦我开始写论文,我就必须很谨慎地完成它.