问题

I met a friend of mine _____ I was walking in the park.
A:before
B:when
C:after
D:if
B:when
C:after
D:if
正确答案是:
同类题型
Would you like some coffee? — Yes, please. Do you have any milk? I prefer coffee _____milk. [ ]
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of the students in our class money for the disabled people these days.
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