单选题
In a supermarket, all commodities are open to customers who can select what they need ______.
A、
with their ease
B、
at their ease
C、
at their easiness
D、
with their easiness
【正确答案】
B
【答案解析】
[解析] 固定搭配。at one"s ease是固定短语，意为“没有拘束的”。故答案为B。
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