It was for the first time that the two countries ______ an agreement.
#100479
A
reached
B
have reached
C
had reached
D
will reach
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In 1960, this was the longest bridge that __________.
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A
was ever built
B
had ever built
C
has ever been built
D
had ever been built
With the development of science,more new technology      to the fields of IT.
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A
has introduced
B
is being introduced
C
is introduced
D
was introduced