单项选择题

In his lecture Prof Smith has （）a wide range of subjects.

A.covered
B.expressed
C.released
D.revealed

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单项选择题
（）the lake around our university was seriously polluted.

A.In time
B.At no time
C.In times to come
D.At one time
单项选择题
He departed （）to catch the train onlyto find his ticket was left in home.

A.in hurry
B.in haste
C.in a haste
D.with haste
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