单选题
The students all feel very tired for they ______ Gao Kao for a year.
A、
has been busy with
B、
have been busy
C、
were busy with
D、
have been preparing for
【正确答案】
D
【答案解析】
[解析] 一般现在时搭配现在完成时,prepare for是固定短语。
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