其实可以用一般现在时、现在进行时或者现在完成时，
具体看语境。
1 如果是“延续动词”,你就用“现在进行时”：
------- What book are you reading these days?
--------He is writing a new novel these days.
2 如果是“瞬间动词”,你就用“现在完成时”
------- Have you lost anything these days
-------Have you been to the library these days?
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