题目内容

【B3】

A. on
B. in
C. at
D. by

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【B8】

A. for
B. of
C. in
D. with

【B5】

A. understand
B. understood
C. understanding
D. understandable

A．Twenty years.B．Nineteen years.C．Thirty years.D．Forty years.

A. Twenty years.
B. Nineteen years.
C. Thirty years.
D. Forty years.

A．2:15.B．3:15.C．2:50.D．3:50.

A. 2:15.
B. 3:15.
C. 2:50.
D. 3:50.