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44. Using a Doppler ultrasound device, fetal heartbeats can be detected by the twelfth week of pregnancy. (A) Using a Doppler ultrasound device, fetal heart-beats can be detected by the twelfth week of pregnancy. (B) Fetal heartbeats can be detected by the twelfth week of pregnancy, using a Doppler ultrasound device. (C) Detecting fetal heartbeats by the twelfth week of pregnancy, a physician can use a Doppler ultrasound device. (D) By the twelfth week of pregnancy, fetal heartbeats can be detected using a Doppler ultrasound device by a physician. (E) Using a Doppler ultrasound device, a physician can detect fetal heartbeats by the twelfth week of pregnancy 1,选项B为什么不对?OG11的解释是说the modifying phrase has no referent 2,E中的by是什么意思?下边这种解释make sense吗? D:by the twelfth week of pregnancy在句首是修饰谓语,意思是:在怀孕的第12周,医生能测到胎儿的心跳.->那其他时间那? E:Using a Doppler ultrasound device, a physician can detect fetal heartbeats by the twelfth week of pregnancy 这里,by the twelfth week of pregnancy是定语修饰heartbeats,意思是:使用多普乐超声波仪器,医生能测到怀孕到第12周的胎儿心跳. 这题,根据逻辑意思,by the twelfth week of pregnancy是定语修饰heartbeats的,应该紧邻修饰对象heartbeats,放在句首或跟在谓语后修饰谓语则改变句意. |