题型:名词解释 Although we’ve learned English for years, we have trouble _____ the foreigners.A.understandB.to understandC.understandingD.of understanding 查看答案
题型:名词解释 On hearing his son's survival, the worried mother _______. [ ]A. burst into crying B. burst out tears C. burst into tears D. burst into laughing 查看答案