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1. I've redone this math problem at least twenty times, but my answer is still wrong according to the answer key. The answer in the book
(must/ ought to) be wrong!
【考点】
情态动词的辨析;
【答案】
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选词填空（单句）
普通
课时演练
换一批
1. The resident physician often
about his working conditions and I'm tired of his
. (complain)
语法填空（单句）
普通
2. We are both very busy so we only see each other
. He pays me
visits in his spare time and we try to use the
to express our love. (occasion)
语法填空（单句）
普通
3. They encouraged the
to
in the singing performance after the contest and their
gave the students much delight. (participate)
语法填空（单句）
普通