从句选择题31.Jasmine was hoildaying with her family in a wildlife

从句选择题
31.Jasmine was hoildaying with her family in a wildlife park _________ she was bitten on the leg by a lion.
A.when B.while C.since D.once
32.____more research is undertaken on the causes of left-handedness,attitudes towards left handed people are gradually changing for the better.
A.As B.If C.Though D.Even if
33.______,understanding only comes fron competitive games.
A.However you play many practice games
B.However do you play practice games
C.However many practice games you play
D.How many practice games you play
34.I was surprised that these people were promoted ___they had any professional skills
A.unless B.since C.whether or not D.if only
35._______there's no difference in general intelligence between boys and girls ,what can explain girl's poor performance in science and mathematics?
A.When B.Though C.While D.If