In the library, I found a useful book ______ how to use English grammar.    
#93528
A
to explain
B
explained
C
having explained
D
explaining
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Robert is said          abroad, but I don’t know in which country he is.
#98083
A
have been studying
B
to have been studying
C
have studied
D
to have studied
 — What do you think made Mary so upset?—  __________ her new bicycle.
#95510
A
As she lost
B
She lost
C
Losing
D
Because of losing
 She admitted _____ the key.
#98306
A
being taking
B
to take
C
having taken
D
to have taken