If you have difficulty______your bill, please tell me as soon as possible.

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问题 If you have difficulty______your bill, please tell me as soon as possible.

选项 A、pay
B、paid
C、to pay
D、paying

答案D

解析 have difficulty in doing sth.为固定用法,意为“在做……方面有困难”,其中动名词作介词in的宾语,介词in可省略,所以空处应用paying。故选D。类似使用动名词作宾语的句型还有have trouble/a good time(in)doing sth.等。
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