They have ______ their friend for twenty minutes.

【参考答案】

考查动词用法。expect指“希望”，其后的to为不定式符号；look forward to指“期盼”，其后不跟人作宾语......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)