单项选择题

His parents are (worried) (because) they haven't heard (of) their son (in) more than two months.

A．worried
B．because
C．of
D．in
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The doctor (told) him that he (should take) this medicine (one) pill at (one) time.
A．told
B．should take
C．one
D．one
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The reason (why) Jack (failed) to (attend) the lecture is (attend) he had a bad cold.
A．why
B．failed
C．attend
D．attend
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