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一道sat语法IS题.

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一道sat语法IS题.
When in 1833 a london carpenter designed the first prefabricated house,( making certain that a single person can) carry any of the precut panels from which it was assembled.
A>making certain that a single person can
B>making certain that a single person could
C>He makes certain that a signle person can
d>he made certain that a single person could
e>he has made certain that a single person could
为什么不是b而是d?
一道sat语法IS题.
这是个时间状语从句、从句中主语是a london carpenter、主句就应该用相应的代词he、如果用现在分词就缺少主语了、是不完整句子里的知识点、
再问: 我语法差。。再问一下哈,如果用he开头为什么不会成为run on呢?