单项选择题

"I bought this computer for $500 last week."
"It's on sale this week for only $400. You should have waited."
"Oh, really But how ______ I know"

A．can
B．will
C．do
D．would
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单项选择题
You should be aware of his ______ question when interviewed tomorrow.
A．loaded
B．filled
C．hidden
D．burdened
单项选择题
Tom ______ in the paper as scheduled, but he was seriously injured two days ago.
A．was to hand
B．was to have handed
C．is to have handed
D．ought to hand
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