I am especially glad that Bob decided to come to the party because we hadnt seen him _several monthA.sinceB.untilC.beforeD.for

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I am especially glad that Bob decided to come to the party because we hadnt seen him _several monthA.sinceB.untilC.beforeD.for
I am especially glad that Bob decided to come to the party because we hadnt seen him _several month
A.since
B.until
C.before
D.for

I am especially glad that Bob decided to come to the party because we hadnt seen him _several monthA.sinceB.untilC.beforeD.for
答案:D.since,until 后跟时间点.before 跟时间段应放后面.所以完成时后面的时间段要用for.