.Everyone should __________ his best to do things wellEveryone should __________ his best to do things well. A. do B to do C does D doing

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.Everyoneshould__________hisbesttodothingswellEveryoneshould__________hisbesttodothingswell.A.doBtod

.Everyone should __________ his best to do things wellEveryone should __________ his best to do things well. A. do B to do C does D doing
.Everyone should __________ his best to do things well
Everyone should __________ his best to do things well.

A. do B to do C does D doing

.Everyone should __________ his best to do things wellEveryone should __________ his best to do things well. A. do B to do C does D doing
A.do
should 是情态动词,它的后面必须跟动词原形!