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16、---I wonder why he ______ so strangely these days.

---Recent pressure at study may account for his behavior.

A. was acting                 B. acted            C. is acting          D. acts

16、C

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---I wonder why he ______ so strangely these days.

---Recent pressure at study may account for his behavior.

A. was acting                 B. acted            C. is acting          D. acts

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