问题
选择题
—Whose watch is lost?
—Mr. Smith's. Look! He _____ it here and there.[ ]
A. looked
B. was looking for
C. looks for
D. is looking for
答案
答案：D
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—Whose watch is lost?
—Mr. Smith's. Look! He _____ it here and there.[ ]
A. looked
B. was looking for
C. looks for
D. is looking for
答案：D
的主要作用是（）