The river is（）……

单项选择题Mother thought ______ a clever boy.

单项选择题Mr. Black is the professor（）I have the greatest respect.

A. to whom
B. for whom
C. whom
D. who

单项选择题—She was late for the party. —That's（）she had forgotten the exact time.

A. why
B. how
C. because
D. whethe

单项选择题Do you know（）they are getting on well with the project

A. whether
B. what
C. how
D. when

单项选择题______ was the story the boy told the reporter.