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單項選擇題

It was in（）the American astronauts succeeded in landing on the moon.

A.when
B.the moment
C.which
D.that

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單項選擇題

It was a great pleasure（）me to be invited to the party.

A.for
B.on
C.to
D.of

單項選擇題

It is not always easy to tell the right（）the wrong.

A.from
B.with
C.than
D.to