问题补充：
is necessary for us to finish the work in two days.
A. They
B. This
C. It
D. That
答案：
A. They
B. This
(答案→)C. It
D. That
解析：此题考查固定句型结构it is+形容词+for sb to do sth表示对某人来说做某事怎样。对我们来说在两天内完成工作是必须的。
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