单项选择题

You must eat green vegetables （）they are good for your health

A. while
B. once
C. because
D. but

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单项选择题

Do you know the type of cat （）Shawn was talking about the other day

A. for
B. who
C. what
D. that

单项选择题

William and Brenda are going to buy a house （）they have enough money.

A. once
B. for
C. although
D. however

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