问题描述:
_____all of the material,John passed the test easily.
_____all of the material,John passed the test easily.
A.Having studied
B.If he had studied
C.He studies
D.To study
_____all of the material,John passed the test easily.
A.Having studied
B.If he had studied
C.He studies
D.To study
问题解答:
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