Doctors tell us_____our hands before and after every meal．（ ）
| A． |
wash |
B． |
washed |
C． |
washing |
D． |
to wash |
Doctors tell us_____our hands before and after every meal．（ ）
| A． |
wash |
B． |
washed |
C． |
washing |
D． |
to wash |
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