问题

How much is _______ for a schoolbag —Experts say students shouldcarry_______ more than 10 or 15 percent of their body weight
A:that
B:those
C:it
D:them
B:those
C:it
D:them
正确答案是:
同类题型
You can’t imagine whatdifficulty we had ______ home in the snowstorm.
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What’s wrong with you, Jane You look tired—I_______ to watch my favorite TV program last night.
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