The shoplifter ____(put) a sweater into his bag when I came into the shop.I caught him by the arm

The shoplifter ____(put) a sweater into his bag when I came into the shop.I caught him by the arm

题目
The shoplifter ____(put) a sweater into his bag when I came into the shop.I caught him by the arm
at once.
答案
The shoplifter (was putting) a sweater into his bag when I came into the shop.I caught him by the arm
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