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.So often ______ in recent years that it has almost become a rule.
A. has this happened B. this has happened
C. is this happening D. for this to happen
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32.So often ______ in recent years that it has almost become a rule.
A. has this happened B. this has happened
C. is this happening D. for this to happen
查看习题详情和答案>>.So often ______ in recent years that it has almost become a rule.
A. has this happened B. this has happened
C. is this happening D. for this to happen
查看习题详情和答案>>So often ______ in recent years that it has almost become a rule.
A. has this happened B. this has happened
C. is this happening D. for this to happen
查看习题详情和答案>>
32.So often ______ in recent years that it has almost become a rule.
| A．has this happened | B．this has happened |
| C．is this happening | D．for this to happen |