摘要： Though the teacher had tried to make the problem easy , still Lily and her partner were at a loss. A. understood B. understanding C. to understand D. to be understood
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Though the teacher had tried to make the problem easy__________, still Lily and her partner were at a loss.
A．understood B．understanding C．to understand D．to be understood
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Though the teacher had tried to make the problem easy__________, still Lily and her partner were at a loss.
| A．understood | B．understanding | C．to understand | D．to be understood |