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【单选题】

The first edition of the magazine was published in 1960, and has been a best-seller _______.
[ ]

A.
ever since
B.
till then
C.
ever before
D.
after that
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举一反三

【单选题】The scientist _____ Canada and he will give us a talk when he _____ back.

A.
has gone to/comes
B.
has been to/will come
C.
has gone to/will come
D.
has been to/comes