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问题:

[单选] The production __________of the factory is now 800,000 units.

ability。power。capacity。possibility。

问题:

[单选] Hisgood sense of humor made a deep impression __________us.

in。on。for。to。

问题:

[单选] __________ had enough time, they would have visited the Great Wall.

Had they。Have they。Would they have。If they。