His mother looked very tired，for she _____ the house herself all day.
#102009
A
had cleaned
B
has been cleaning
C
had been cleaning
D
has cleaned
推荐题目
It is said that the software on learning subjects for pupils in a very practical way.
#100082
A
designed
B
designing
C
are designed
D
is designed
-- How can I apply for an online course? -- Just fill out this form and we _______ what we can do four you.
#102945
A
see
B
are seeing
C
have seen
D
will see
Nelson Mandela__________ peacefully at his Johannesburg home on Thursday，President Jacob Zuma said.
#99626
A
dies
B
died
C
has died
D
had died
—Could you meet me at the airport?—I’d like to，but I______Shanghai when you return.
#104356
A
will have left
B
was leaving
C
will leave
D
have left
She volleyball regularly for many years when she was young.
#99866
A
was playing
B
played
C
has played
D
had played