IF you are late,you()pay the bill1.have to2.must3.had to4.will must

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IF you are late,you()pay the bill1.have to2.must3.had to4.will must
IF you are late,you()pay the bill
1.have to
2.must
3.had to
4.will must

IF you are late,you()pay the bill1.have to2.must3.had to4.will must
must
主祈从现(情态动词没有将来式)

will must
典型的条件状语从句,主将从现!

2.must