问题
选择题
—I bought this shirt for 35 yuan yesterday.
—It’s on sale today for only 29. You should have waited.
—Oh, really? But how ________ I know?
A．would
B．can
C．did
D．do
答案
答案：C
因为意思是“我当时 (昨天) 怎么知道呢？”。
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