问题
Bob is ________ eleven-year-old boy, but he knows a lot about the Internet.
A:an
B:a
C:the
D:/;
B:a
C:the
D:/;
正确答案是：
同类题型
_____ of the students who took part in the military training is 450.
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Monica was ____________ with me for further particulars.[ ]
We didn’t _____ the match.— What a pity!
We look forward to the day when the car will be replaced by some less dangerous_______ of transport.