单项选择题

Why is （） you are not well prepared for the class.

A. it
B. that
C. that it
D. it that

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A person’s calorie requirements vary （） his life.

A. across
B. throughout
C. over
D. within
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He always did well at school （） having to do part time jobs every now and then.

A. in spite of
B. regardless of
C. on account of
D. in case of
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