he didn’t know much about the harmful effects on smoking,为什么

he didn’t know much about the harmful effects on smoking,为什么 people didn't know much about the sun or the He knew(much)about the mammoths,didn't he?为什么不用a few? 选择He didn't know ( )about it scientists didn't know much about lung cancer——. Scientists didn’t know much about lung cancer _____. I know nothing about the reason ,_____ he didn't come to the He didn't know what to do about it 为什么填what 不是有it吗? Even he didn't know where he shuold get on the bus 同意句 Even He didn't know ( i didn't know about it until he told me . Helen didn’t know anything about it ___________________ he