单项选择题

The person _____ you were talking to was an American.（）

A. who
B. whom
C. which
D. as

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单项选择题
Walking along the river, he heard someone _____ for help.（）

A. shouting
B. shout
C. shouted
D. having shouted
单项选择题
The reason _____ he failed the exam was _____ he had not worked hard.（）

A. why……if
B. why……that
C. that……why
D. why……what
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