单项选择题

-I cannot find Tom anywhere.
-He ______ have been off long. I heard him make a call just now.

A) shouldn ' t
B) can' t
C) mustn' t
D) needn' t
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单项选择题
When the couple ______ here, they ______ to the park.
A) will come; will go
B) come; go
C) will come ; go
D) come ; will go
单项选择题
No matter who he is, young or old, people' s state of mind tends to keep ______ with the rapid change of society.
A) contact
B) progress
C) touch
D) pace
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