________ the convenience of digital payment, many senior citizens started to use smart phones.

1. ________ the convenience of digital payment, many senior citizens started to use smart phones.

A. To enjoy B. Enjoying C. To have enjoyed D. Enjoy

【考点】

动词不定式;

【答案】

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单选题普通

1. Kathy reached the company out of breath only ____ she was fired.

A. told B. tobetold C. beingtold D. havingtold

单选题困难

2. ________ his restless students occupied with an indoor sport on rainy days, James Naismith created basketball.

A. To be kept B. Kept C. To keep D. Keeping

单选题普通

3. students English well, the teacher tries to speak English in class very often.

A. Teaching B. Taught C. To teach D. Teach

单选题普通