Lessons can be learned to face the future, ________ history cannot be changed.A．_刷题宝

题干

Lessons can be learned to face the future, ________ history cannot be changed.

A．though

B．as

C．since

D．unless

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同类题1

Cable TV began in 1948 in the USA, but it took 50 years ________ 66 percent of American households had it.

A．before	B．when
C．after	D．until

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