两会关于“双一流”的性质定位是：中国特色，世界一流。（ ）
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The house is dirty. It ______ for months.
A. hasn’t cleaned
B. didn’t clean
C. wasn’t cleaned
D. hasn’t been cleaned
Everything on the earth ____ all the time.
A. is changed
B. is changing
C. has changed
D. has been changed
She does not possess a car; this one she uses _____ to Henry.
A. is belonged to
B. belonged
C. belongs
D. is belonging
The door ____ with difficulty.
A. is shutting
B. shuts
C. was shut
D. is shut
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