Hi Nathan,
There is no problem importing your Cloze question into Moodle 1.6+ (I'm using 1.6.3).
Create a text file with your question text in it, and call it for example Conjugate.txt.
In your Moodle course, Administration / Questions, go to any category and click on the Import question from file link. In the File format field, select Embedded Answers (Cloze), upload your Conjugate.txt file. Click the Upload this file button. You can see this message:
Importing 1 questions from file
1. Conjugate kommen ich du {:SHORTANSWER:=kommst} er {:SHORTANSWER:=kommt} wir {:SHORTANSWER:=kommen} ihr {:SHORTANSWER:=kommt} sie {:SHORTANSWER:=kommen}
Your question has been correctly imported into your question bank.
Can you please follow all these steps and report back if you still have a problem? Please note that you can have only one Cloze type question in an import file. I do not know exactly why you would want to do that. What is the advantage over typing the question directly in question edit mode?
Joseph