dangling modifier

Though normally completed in one year on a full-time basis, allowances are made to extend that  to 30 months to assist students who may need to juggle various other commitments.

以上句子有咩錯?

錯在:The problem is the dangling participle. The writer presumably means that the course is normally completed in one year, but the way they have constructed the sentence implies that allowances are normally completed in that time.

正確是:Though normally completed in one year on a full-time basis, if necessary they can be extended to 30 months to assist students who may need to juggle various other commitments.