http://fujian.hteacher.net 2021-11-09 15:41 福建教师资格证 [您的教师考试网]
秘诀六、-ing形式或to do可作主语或宾语，-ed形式则不可以。
例11.___________in a heavy traffic jam is quite an unpleasant experience.
A. Caught B. Having caught
C. Being caught D. To catch
【解析】本题中is为系动词，前面应该作主语，用-ing形式，所以答案为C。
例12.______twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.
A. Examining B. Examined
C. Being examined D. Having been examined
【解析】本题中is为系动词，前面应该作主语，用-ing形式，所以答案为C。
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