单项选择题

If you are in difficulty, don't hesitate to ask()my help.

A.to
B.about
C.from
D.for

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单项选择题

Only after being asked several times () us the story of his strange life.

A.he could tell
B.then he told
C.did he tell
D.he began to tell

单项选择题

They () visit us a lot but they don't now.

A.must
B.need
C.can
D.used to

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