问题

I heard Lucy ________ happily in her room when I passed her house.
A:sing
B:to sing
C:singing
D:sings
B:to sing
C:singing
D:sings
正确答案是:
同类题型
Why do you ____ the radio? I can’t hear the light music clearly.—I’m afraid of waking the baby up.
Where’s Lucy?—I’m not sure. She ________ in the school library.
Do you go to school __________ Saturday morning?[ ]
It ____ me nearly two hours to finish my homework yesterday.
What kind of musician do you like?—I like musicians _________write their own songs.