We can never forget the days _______the two astronauts in spaceship worked together and the days ______

We can never forget the days _______the two astronauts in spaceship worked together and the days _______we spent together.

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which; when

when; which

what; that

on which; when

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His plan was such a good one_________we all agread to accept.

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and

that

In all his life, Dickens wrote a large number of excellent novels in the 19th century, _____ some are still popular nowadays.

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whose

of that

in which

of which

Peter told us the work would be finished by next month, ________ personally I doubt very much.

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which

when

that

His plan was such a good one ______ we all agreed to accept.

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and

that

She brought with her three friends，none of ________ I had ever met before.

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them

who

whom

these