thebeginningofthe19thcenturydi-优题课

_____the beginning of the 19^th century did scientists know that all matter is made up of atoms.
A,At B,By C,Up to D,Not until

科目英语题型单选题难度中等

7．Perhaps it will never be known __________ he did with those materials on the incident．

one children want to challenge themselves by learning a language different from ______ their parents speak at home.

（重庆一中高三下第三次月考）7. John enjoys football but he knows the fact _____ he doesn’t have _____ it takes to be a professional.

I am afraid he’s more of a talker than a doer, which is ______ he never finishes anything.

（年福州市高三适应性练习）33.— Your sneeze tells me you may have a flu.
— No. It’s just __________ I can’t stand the smell of the paint here.