第二节 完型填空
阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选择能填入相应空白处的最佳选项。
Tom was only seven【41】, so when he went【42】 to camp with a lot of other small boys one summer, his mother thought he might be unhappy, and arranged for all his aunts and his grandmother and all his relatives to write【43】 him, so that he【44】 get a letter every day while he【45】 away from home.
Well, of course he did not write to anybody while he was at camp. A few days【46】 he came back【47】, his mother saw him【48】 some papers and asked him what【49】
"Oh", he said, "they are the letters I got while I was【50】 the camp, I did not have time to look at them while I was there."
(41)

A. year
B. years
C. years old