I found his theory difficult________.

I found his theory difficult________.
[ ]
A. understand
B.to understand
C. understood
D.to be understood
helenxing 1年前 已收到1个回答 举报

xyy1250179 春芽

共回答了21个问题采纳率:90.5% 举报

B

1年前

7
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