His partner helped him____the difficult problem at last.

1. His partner helped him____the difficult problem at last.

A. solved B. tosolved C. solving D. solve

【考点】

动词原形;

【答案】

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单选题容易

1. Would you please ____ us a break? We need a moment for rest.

A. togive B. giving C. give

单选题容易

2. You should ____more water when you have a fever.

A. drinking B. drink C. drank D. todrink

单选题容易

3. She can't ______us because she has too many things to do.

A. join B. joining C. joined D. to join

单选题容易