1编号：3337题型：单选题测试正确率：85.26%
—Is this John’s T-shirt? —It______ be his. It`s much too small for him.
2编号：3292题型：单选题测试正确率：68.47%
We'd better ______ others when they make mistakes.
3编号：3279题型：单选题测试正确率：74.67%
— Whose shirt is this? — It ______ be Tony's. It is much too small for him.
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