Question

【题目】I won't be able to go to the party I will be on vacation．
A.although
B.unless
C.since
D.whenever

Answer 1

【答案】C
【解析】句意：我不能去派对……我将要去度假 。此处是指既然我要去度假，我就不能去参加聚会了。since因为，既……although虽然，unless除非，whenever无论何时，故选C。