It is + adj. + to do句型 — 英语选择题
题目
为方便轮椅使用者进入社区活动室，选出句型和语境都正确的一句。A. It is important keeping the doorway clear. B. It important to keep the doorway clear. C. It is important to keep the doorway clear. D. It is important keep the doorway clear.