单项选择题

—"Is Philip over his cold yet"
—"He（）.He went ice-skating yesterday."

A．had to
B．ought to
C．must be
D．must have

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单项选择题
They concentrated their efforts on（）products of high quality.

A．turning on
B．turning off
C．turning out
D．turning over
单项选择题
Tom was on his way to meet his father, whom he（）for many years.

A．has not seen
B．not saw
C．had not seen
D．did not see
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