以读写方式打开一个已存在的文本文件test.dat，可以使用FILE *fp;fp=fopen("test.dat","r+");
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A little child ______ to walk often falls.
A. learning
B. learn
C. to learn
D. learned
The tall man is a ______ student.
A. return
B. returned
C. returning
D. to return
The girl ______ next to me was my cousin.
A. is sitting
B. sit
C. sitting
D. to sit
She bought a computer ______ in China.
A. produce
B. producing
C. to produce
D. produced
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