问题
选择题
Mr. Smith would have come to see you if it had been possible, but he _______ so busy.[ ]
A. was
B. had been
C. has been
D. were
答案
答案：A
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Mr. Smith would have come to see you if it had been possible, but he _______ so busy.[ ]
A. was
B. had been
C. has been
D. were
答案：A