1. ____ with the size of the whole earth, the biggest ocean does not seem big at all.
A. Compare B. When comparing
C. Comparing D. When compared
【解析】选D 相当于when it is compared。
2. ____ snacks and drinks, but they also brought cards for entertainment when they had a picnic in the forest.
A. Not only they brought B. Not only did they bring
C. Not only brought they D. Not only they did bring
【解析】选B not only...but also引导的并列句;以not only开头的句子要部分倒装。
3. ____, he used to helped his father on the farm.
A. When was a boy B. As he was a boy
C. As a boy D. During a boy
【解析】选C as在这里是连词;as a boy = when (he was) a boy。