It was not until man had learned how to make iron and steel that the construction of various...
It was not until man had learned how to make iron and steel that the construction of various...
It was not until man had learned how to make iron and steel that the construction of various machines________possible.
A.were made
B.made
C.had made
D.was made
It was not until man had learned how to make iron and steel that the construction of various machines________possible.
A.were made
B.made
C.had made
D.was made
英語(yǔ)人氣：572 ℃時(shí)間：2020-02-26 05:45:36
優(yōu)質(zhì)解答
D.直到人類(lèi)學(xué)會(huì)煉制金屬,各種機(jī)械的制造才成為可能.制造是單數(shù),而且是被人做.時(shí)態(tài)發(fā)生在制金屬之后.
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