George appears______a hard time convincing his employer that he is right over it.A.havingB

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George appears______a hard time convincing his employer that he is right over it.

A.having

B.to be having

C.to have

D.having had

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。