单选题
The period ______ dance classes increases gradually from two or three hours a day to five or six.
A、
referred to
B、
kept to
C、
attached to
D、
given to
【正确答案】
D
【答案解析】
given to意为“分配给”;refer to意为“谈及,意指”;be attached to意为“附属于”。
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