--- Shall we call on Frank tonight?---We’d better not. He is said ________ a lecture.
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A
preparing
B
to be preparing
C
to have prepared
D
having prepared
推荐题目
There were two roads ______ to the station. 
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A
lead
B
led
C
leading
D
to lead
 Although in a hurry, Wilson ______.
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A
couldn’t stop walking
B
couldn’t help the stranger
C
stopped to help the stranger
D
didn’t answer the stranger