如果把主句中的have 改为过去式had ,答案就是B 和D 那种形式,一般情况下could 和would 可以互换!
非限定性定语从句起补充说明作用,缺少也不会影响全句的理解,在非限定性定语从句的前面往往有逗号隔开,如若将非限定性定语从句放在句子中间,起前后都需要用逗号隔开.
简单地说,去掉这个从句,句子的成分还是完整的!讲得过去,不会出现语法错误!它只是让这句话的意思很具体明确了!
If you have made good preparation before,you ______ about th
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