John has got a full mark in the test. He ______ very hard all these days.A、will

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问题 John has got a full mark in the test. He ______ very hard all these days.

选项 A、will work
B、may work
C、must have worked
D、could have worked

答案 C

解析

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Johnhasgotafullmarkinthetest.He______veryhardallthesedays.A、will