单选题
阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选出能填入相应空白处的最佳选项。

One afternoon Mary was walking from her house to the seaside (海边,海滨 ){{U}} (41) {{/U}}she saw a small boy{{U}} (42) {{/U}}along the street towards her. When he came (来, 出现) near her, she was{{U}} (43) {{/U}}to see it was Tom, her little brother.
"Hello, Tom," Mary shouted to him. "Why are you running like that?"
Tom couldn't stop,{{U}} (44) {{/U}}he waved to his sister and shouted "I'm trying{{U}} (45) {{/U}}two boys{{U}} (46) {{/U}}fighting."
Mary was surprised again, she laughed and said, "That's an important {{U}}(47) {{/U}}for a little boy,{{U}} (48) {{/U}}? You don't do things like that very often. Who are the two boys?"
"They are Jim and me," answered Tom, when he{{U}} (49) {{/U}}down {{U}}(50) {{/U}}very quickly.

A、

[A] when
B、

[B] while
C、

[C] before

【正确答案】 A

【答案解析】主句用过去进行时，状语从句要用when 引导，表示在过去某一时刻持续发生的动作。

A、

[A] to run
B、

[B] running
C、

[C] ran

【正确答案】 B

【答案解析】句型see sb. do sth. 或see sb. doing sth.前者表示看到动作全过程，后者表示动作正在进行。根据上下文，run 动作应该正在进行。

A、

[A] surprised
B、

[B] surprising
C、

[C] surprise

【正确答案】 A

【答案解析】be surprised to do sth.

A、

[A] but
B、

[B] or
C、

[C] and

【正确答案】 A

【答案解析】句意：汤姆停不下来，但他还是冲姐姐招手并喊道……这里应该填一个表示转折的并列连词。

A、

[A] to stop
B、

[B] stop
C、

[C] stopping

【正确答案】 A

【答案解析】短语：try to do sth．试着做某事。

A、

[A] of
B、

[B] from
C、

[C] for

【正确答案】 B

【答案解析】短语：stop sb．doing sth．阻止某人做某事。

A、

[A] work
B、

[B] game
C、

[C] job

【正确答案】 C

【答案解析】阻止两个人打架不是game，而是一项工作。注意到前面有个 an，所以填可数名词job。

A、

[A] isn't it
B、

[B] aren't you
C、

[C] is that

【正确答案】 A

【答案解析】反意疑问句，前半句是肯定句，后半句应该是否定句，且应对句子的主词job 进行反问。应该填isn't it。

A、

[A] went on running
B、

[B] went on with running
C、

[C] went on to run

【正确答案】 A

【答案解析】短语：go on doing，继续做某事。

A、

[A] the house
B、

[B] the sea
C、

[C] the street

【正确答案】 C

【答案解析】第二行有“along the street towards her”，提示此空应该是 street。