They______(learn)about two thousand English words since they came to college.

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They______(learn)about two thousand English words since they came to college.

They______(learn)about two thousand English words since they came to college.
They______(learn)about two thousand English words since they came to college.

They______(learn)about two thousand English words since they came to college.
have learned
从后面的 since they came to college 可以看出要用现在完成时