问题

suffer an injury during exercise, or if _ pain or discomfort makes you think an injury isdeveloping, stop right away and call me.

A:the; a
B:不填; the
C:an; the
D:不填; 不填

正确答案是：

同类题型

the blind wandering through the traffic,motorists would have to step on their brakes at once

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________—He’s friendly and helpful.

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