Itwas1969___theAmericanastronautssucceededinlandingonthemoon.（） A: which B: that C: onwhich D: when

Itwas1969___theAmericanastronautssucceededinlandingonthemoon． A: that B: when C: onwhich D: which

Theworld____weliveismadeupofwater. A: atwhich B: inwhich C: onwhich D: ofwhich

Theworld______weliveismadeupofmatter. A: onwhich B: ofwhich C: atwhich D: inwhich