问题描述：
Because he didn't know how to do it,he went to her for help._____ _____how to do it,…….
可否直接用Didn't know how to do it,…… .
还是Not knowing how to…….
Because he didn't know how to do it，he went to her for help.
句型转化为 _____ _____how to do it，…….
可否直接用Didn't know how to do it,…… .
还是Not knowing how to…….
Because he didn't know how to do it，he went to her for help.
句型转化为 _____ _____how to do it，…….
问题解答：
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