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用should,ought to或have to的正确形式填空

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用should,ought to或have to的正确形式填空

He  ________  (come) at 4 o'clock if the plane arrives on time.

I didn't go shopping this morning as I __________  (do) the housework

She ________   (come) to see me yesterday,but she forgot.

You _________ (ask) for permission before you left the table.

As they didn't understand,I _________(explain) everything again

用should,ought to或have to的正确形式填空
1.should come 2.had to do 3.should have come 4 should have asked 5 had to explain