单项选择题

It was two weeks before Christmas, and Mrs. Smith was very busy. she (41) a lot of christmas cards to send to her friends and her husband’s friends. She (42) them on the table in the sitting room. Then, when her husband came home (43) work, she said to him, "Here are the Christmas cards (44) our friends. Will you please (45) the cards while I (46) the dinner"
Mr. Smith didn’t say anything, but walked (47) the room and went into his study. Mrs. Smith was very (48) at him.
Then a minute later Mr. Smith came back (49) a box of Christmas cards, and said, "They are for last year. I (50) to post them.\

A. toward
B. on
C. for
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