Bob， dinner is ready． Please wash your hands ________ you eat．（ ）
| A． |
until |
B． |
after |
C． |
while |
D． |
before |
Bob， dinner is ready． Please wash your hands ________ you eat．（ ）
| A． |
until |
B． |
after |
C． |
while |
D． |
before |
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