Please indicate on the enclosed copy of your order form ______ you want to place a cash order now.
A、when
B、whether
C、until
D、unless
【正确答案】:B
【题目解析】:句意:请在随函所附的订单副本上注明您现在是否想下现金订单。
Please indicate on the enclosed copy of your order form ______ y
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