Mom won't let Dick go out ________ he promises to be back by 10：00 tonight．（ ）
| A． |
if |
B． |
when |
C． |
since |
D． |
unless |
Mom won't let Dick go out ________ he promises to be back by 10：00 tonight．（ ）
| A． |
if |
B． |
when |
C． |
since |
D． |
unless |
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