问题

This company was the first ___________ portable radios as well as cassette tape recorders in the world.[ ]

A: producing
B: to produce
C: having produced
D: produced

正确答案是：

同类题型

The speech given by Primer Wen Jiabaoshowed ______ broad knowledge he has.

great efforts, we failed to carry ourplans through, which made us very disappointed.

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How do you spell it —–____________.

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