______ us prepare for the exam，the teacher suggested reading through our notes．（ ）
| A． |
To help |
B． |
Helped |
| C． |
Helping |
D． |
Being helped |
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______ us prepare for the exam，the teacher suggested reading through our notes．（ ）
| A． |
To help |
B． |
Helped |
| C． |
Helping |
D． |
Being helped |
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