更多"Earthworms occur ______adequate moi"的相关试题:
[单项选择]Earthworms occur（）adequate moisture and food and the necessary soil conditions are found.
A. and
B. whenever
C. however
D. wherever
[单项选择]Earthworms occur ______ adequate moisture and food and the necessary soil conditions are found.
A. and
B. whenever
C. however
D. wherever
[单项选择]Earthworms occur______adequate moisture and food and the necessary soil conditions are found.
A. but
B. where
C. however
D. and
[单项选择]Most environmental problems exist because adequate measures for preventing them（）in the past.
A. was not taken
B. were not taken
C. didn't take
D. haven't taken
