He has been watching English movies___ about two monthsA since B for C in D during

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He has been watching English movies___ about two monthsA since B for C in D during

He has been watching English movies___ about two monthsA since B for C in D during
He has been watching English movies___ about two months
A since B for C in D during

He has been watching English movies___ about two monthsA since B for C in D during
B
她已经连续看了两个月的英语电影了.
完成时,所以后面跟一段时间,所以用介词for

B
长达多久 用for

b