问题标题:
【Manypeoplewatchedtheboys_____themountainatthattime.A.climbB.climbingC.toclimbD.climbed改选哪个?】
问题描述:

Manypeoplewatchedtheboys_____themountainatthattime.

A.climbB.climbingC.toclimbD.climbed改选哪个?

程慧俐回答:
  B,watchsbdoingsth固定的罢
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