if是如果的意思
as是因为的意思
unless是除非的意思
when是当的意思
这句话的意思是“鲍勃没有承诺在参加足球比赛,因为他帮助他的父母在农场”
所以选B
bob is not promised to join in the football match____ he has to help his parents on the farm
bob is not promised to join in the football match____ he has to help his parents on the farm
A、if
B、as
C、unless
D、when
A、if
B、as
C、unless
D、when
英语人气：157 ℃时间：2019-10-17 14:13:28
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