( )21. A grand celebration along with the military parade was broadcast live at 11 am，________ millions of families were sitting in front of the television, watching it.
A. which B. when C. what D. that
( )22. —Ouch! I ________ this really bad toothache for about three days.
—You really need to take a day off and see a dentist.
A. have B. am having C. have had D. had
( )23. —This new dress code ________ everyone at school, teachers and students alike.
—Yes, there are no exceptions.
A. applies to B. subscribes to C. adds to D. contributes to
( )24. We didn't travel much during the holiday, ________ because of the tight budget, but also because of the huge crowds.
A. in turn B. in part C. in vain D. in effect
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