Helen _______ very excited _______ the party.
根据问句选答句，将序号写在前面的括号里。
My trousers ________ very dirty. I washed them. A. were B. is C. was
We bought ________ a present.A. your B. yours C. you
I went to Beijing ________ 2008.A. at B. in C. on
How many ______ did you eat?A. biscuit B. biscuits C. a biscuit
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