问题

olving the problem a second time,you’d better be more careful____you made a mistake

A:nervously andpuzzled
B:nervous and puzzling
C:nervous andpuzzled
D:nervously and puzzling

正确答案是：

同类题型

We look forward to the day when the motorcar has beenreplaced by some less dangerous ______of transport.

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Are there any animals in the zoo—

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