单项选择题
"Have you met Bill's brothers""I've met one. I didn't know he had_________."
单项选择题 "I'd like to see_________ Mr. Smith, please.""Do you mean_________ Mr. Smith _________stage manager"
单项选择题 There used to be a cherry tree in this field,_________
单项选择题 _________luck would have it, we arrived in time to catch the 8:00 o'clock flight to Madrid.
