问题
选择题
_________ they were here now, we would be able to celebrate their wedding anniversary.
A．Only if
B．If only
C．Because
D．When
答案
答案：B
考查连词。_________ they were here now,用的是和现在情况相反的虚拟语气，四个选项中只有If only后面跟虚拟语。所以选B。