He is ill, and he has ___ in bed for a week.
#103922
A
lay
B
lied
C
laid
D
lain
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Experiments of this kind ___in both the U.S and Europe well before the Second World War.
#100251
A
had conducted
B
have conducted
C
have been conducted
D
had been conducted
A lot of food as well as some tents _________to Yushu since the earthquake occurred.
#102740
A
has been transported
B
have been transported
C
is being transported
D
are transported