单项选择题
A. with B. on C. for D. at
The professor required that all the essays（）ready by ne...
单项选择题The professor required that all the essays（）ready by next Monday.
A. to be B. be C. being D. are
Colorblind people find it difficult to（）shades of color...
单项选择题Colorblind people find it difficult to（）shades of colors.
A. distinguish B. pick C. identify D. recognize
They hardly believed that the troop（）the river that nig...
单项选择题They hardly believed that the troop（）the river that night, and surrounded their city.
A. to cross B. had crossed C. crossing D. cross
