单选题：---The box is too heavy to carry. What's in it? ---Oh, it

题目内容：

---The box is too heavy to carry. What's in it? ---Oh, it is ___________ books. A．filled with
B．covered with
C．used for
D．asked for

参考答案：

答案解析：

After a lot of training, Liu Xiang __________ many difficu

After a lot of training, Liu Xiang __________ many difficulties. And he is at

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