23．the teacher behind me I didn’t have to worry. He was sure to lend me a hand.A. Because

问题补充：

23．the teacher behind me, I didn’t have to worry. He was sure to lend me a hand.

A. Because

B. With

C. As

D. Because of

答案：

A. Because

(答案→)B. With

C. As

D. Because of

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