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【单选题】

---Where are you, Tom?
---Here in the sitting room, ___to Professor Smith.

A.
to write
B.
writing
C.
is writing
D.
to be writing
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参考答案:
参考解析:
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举一反三

【单选题】The situation is getting worse.We must __________ the trouble _____________.

A.
keep; spreading
B.
prevent; spreading
C.
stop; to spread
D.
protect; to spread