已知{an}是等比数列，且a1+a4+a7=45，a2+a5+a8=90，则a3_爱下问搜题

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问题选择题

已知{a_n}是等比数列，且a₁+a₄+a₇=45，a₂+a₅+a₈=90，则a₃+a₆+a₉的值是[ ]

A．180

B．135

C．45

D．100

答案

答案：A

选择题

I regreted_________him the news that our team had failed.

A．to tell

B．telling

C．having told

D．to have told

选择题

— _____ are the Olympic Games held?
—Every four years.

A. How long
B. How often
C. How soon
D. How much