We did not know why they ------leave A had B had to C must Dmight

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We did not know why they ------leave A had B had to C must Dmight
We did not know why they ------leave A had B had to C must Dmight

We did not know why they ------leave A had B had to C must Dmight
B had to 不得不离开的原因
must 表100%的肯定,和why连用不合适

B 不得不

b