单项选择题
A．helped develop the creativity of a scientist B．kept a rare gift for a scientist C．prevented a scientist from thinking freely D．contributed a lot to science and technology
Quite a lot of people came over to help the poor man（） ...
单项选择题Quite a lot of people came over to help the poor man（） at once.
A. not asking B. without being asked C. without asking D. not asked
21（）A．importantB．impossibleC．impoliteD．interesting
单项选择题21（）
A．important B．impossible C．impolite D．interesting
--"Did you review your lessons last night"--"No, but if...
单项选择题--"Did you review your lessons last night"--"No, but if I （）, I would have done better on today’s test."
A. had reviewed my lessons B. will review my lessons C. have reviewed my lessons D. have done
